See https://github.com/NagiosEnterprises/nrpe/commit/dc3637f64cedac07197fbc9936022578f9f44855

* main/dovecot: Properly set primary group in .pre-install.
main/dovecot/dovecot.pre-install

* main/{npre,postgrey}: Properly set primary group in .pre-install.
main/nrpe/nrpe.pre-install
main/postgrey/postgrey.pre-install

* main/ympd: Reorder arguments in .pre-install as in da4e96aa.
main/ympd/ympd.pre-install

* main/znc: Reorder arguments in .pre-install as in da4e96aa.
main/znc/znc.pre-install

* main/aports-build: Reorder arguments in .pre-install as in da4e96aa.
main/aports-build/aports-build.pre-install

* main/atheme-iris: Fix overlooked consistency issue as in a60b9f07.
main/atheme-iris/atheme-iris.pre-install

* main/[various]: Add group and use it as primary in .pre-* scripts.
main/apache2/apache2.pre-install
main/aports-build/aports-build.pre-install
main/atheme-iris/atheme-iris.pre-install
main/clamav/clamav-db.pre-install
main/clamsmtp/clamsmtp.pre-install
main/clamsmtp/clamsmtp.pre-upgrade
main/coova-chilli/coova-chilli.pre-install
main/dhcp/dhcp.pre-install
main/djbdns/dnscache.pre-install
main/djbdns/tinydns.pre-install
main/ez-ipupdate/ez-ipupdate.pre-install
main/fetchmail/fetchmail.pre-install
main/freeswitch/freeswitch.pre-install
main/gitolite/gitolite.pre-install
main/gnats/gnats.pre-install
main/gross/gross.pre-install
main/icecast/icecast.pre-install
main/memcached/memcached.pre-install
main/ngircd/ngircd.pre-install
main/openntpd/openntpd.pre-install
main/snort/snort.pre-install
main/squid/squid.pre-install
main/squid/squid.pre-upgrade
main/transmission/transmission-daemon.pre-install
main/znc/znc.pre-install

Fixes the problem I unintentionally brought in commit ccc056db:
system user creation doesn't add same named group and uses nogroup as
primary group unless explicitly specified via -G.

Now all invocations have following order of arguments (if present):

    addgroup -S -g ... GROUP
    adduser -S -u ... -D -H -h ... -s ... -G ... -g ... USER

Following rules have been applied:
- script starts with shebang !#/bin/sh followed by blank line,
- script ends with exit 0 prepended by blank line,
- only stderr of adduser, addgroup or passwd is redirected to /dev/null,
- getent passwd/group instances has been removed,
- manual checking of file and group existence has been removed,
- `|| true` instances has been removed.

Comments and line wrapping have been preserved.

This way we can avoid ugly default:

    Linux user,,,

Groups and users created by packages shouldn't use high ids by default
(unless explicitly requested), to distinguish them from groups and users
created by administrators for humans.

Following 41 files lacked -S next to addgroup:
- community/sword/sword.pre-install
- main/amavisd-new/amavisd-new.pre-install
- main/chrony/chrony.pre-install
- main/cvechecker/cvechecker.pre-install
- main/dnsmasq/dnsmasq.pre-install
- main/freeradius/freeradius.pre-install
- main/gdnsd/gdnsd.pre-install
- main/haproxy/haproxy.pre-install
- main/haproxy/haproxy.pre-upgrade
- main/kamailio/kamailio.pre-install
- main/logcheck/logcheck.pre-install
- main/mlmmj/mlmmj.pre-install
- main/nrpe/nrpe.pre-install
- main/open-vm-tools/open-vm-tools.pre-install
- main/postgrey/postgrey.pre-install
- main/privoxy/privoxy.pre-install
- main/redis/redis.pre-install
- main/samba/winbind.pre-install
- main/sircbot/sircbot.pre-install
- main/smokeping/smokeping.pre-install
- main/squark/squark.post-install
- main/squid/squid.pre-install
- main/squid/squid.pre-upgrade
- main/subversion/subversion.pre-install
- main/trac/trac.pre-install
- main/vsftpd/vsftpd.pre-install
- main/zabbix/zabbix-agent.pre-install
- testing/3proxy/3proxy.pre-install
- testing/cluster-glue/cluster-glue.pre-install
- testing/elasticsearch/elasticsearch.pre-install
- testing/emby/emby.pre-install
- testing/gdnsd/gdnsd.pre-install
- testing/icinga2/icinga2.pre-install
- testing/lusca/lusca.pre-install
- testing/lusca/lusca.pre-upgrade
- testing/mongodb/mongodb.pre-install
- testing/openxcap/openxcap.pre-install
- testing/prosody/prosody.pre-install
- testing/rancid/rancid.pre-install
- testing/rutorrent/rutorrent.pre-install
- testing/zabbix/zabbix-agent.pre-install

Following 60 files lacked -S next to adduser:
- community/caddy/caddy.pre-install
- community/domoticz/domoticz.pre-install
- community/minetest/minetest-server.pre-install
- community/oscam/oscam.pre-install
- community/seafile/seafile-server.pre-install
- community/syncthing/syncthing.pre-install
- main/apache2/apache2.pre-install
- main/aports-build/aports-build.pre-install
- main/atheme-iris/atheme-iris.pre-install
- main/bind/bind.pre-install
- main/clamav/clamav-db.pre-install
- main/clamsmtp/clamsmtp.pre-install
- main/clamsmtp/clamsmtp.pre-upgrade
- main/coova-chilli/coova-chilli.pre-install
- main/cvechecker/cvechecker.pre-install
- main/dhcp/dhcp.pre-install
- main/distcc/distcc.pre-install
- main/djbdns/dnscache.pre-install
- main/djbdns/tinydns.pre-install
- main/dovecot/dovecot.pre-install
- main/ez-ipupdate/ez-ipupdate.pre-install
- main/fetchmail/fetchmail.pre-install
- main/freeswitch/freeswitch.pre-install
- main/gitolite/gitolite.pre-install
- main/gnats/gnats.pre-install
- main/gross/gross.pre-install
- main/icecast/icecast.pre-install
- main/kamailio/kamailio.pre-install
- main/lighttpd/lighttpd.pre-install
- main/mariadb/mariadb.pre-install
- main/memcached/memcached.pre-install
- main/ngircd/ngircd.pre-install
- main/nrpe/nrpe.pre-install
- main/openntpd/openntpd.pre-install
- main/postgrey/postgrey.pre-install
- main/snort/snort.pre-install
- main/squid/squid.pre-install
- main/squid/squid.pre-upgrade
- main/subversion/subversion.pre-install
- main/trac/trac.pre-install
- main/transmission/transmission-daemon.pre-install
- main/ympd/ympd.pre-install
- main/znc/znc.pre-install
- testing/at/at.pre-install
- testing/buildbot-slave/buildbot-slave.pre-install
- testing/buildbot/buildbot.pre-install
- testing/clapf/clapf.pre-install
- testing/cluster-glue/cluster-glue.pre-install
- testing/dbmail/dbmail.pre-install
- testing/dspam/dspam.pre-install
- testing/ejabberd/ejabberd.pre-install
- testing/emby/emby.pre-install
- testing/mongodb/mongodb.pre-install
- testing/opensips/opensips.pre-install
- testing/pdns/pdns.pre-install
- testing/prosody/prosody.pre-install
- testing/qpage/qpage.pre-install
- testing/rrdbot/rrdbot.pre-install
- testing/wt/wt.pre-install
- unmaintained/ejabberd-git/ejabberd-git.pre-install

for musl build. the changes are automatically done based on previous
build log errors, so this does not guarantee successful build, but
is a required.

fixes #1672

upgrade nrpe to 2.13

this is needed for apk-tools-2.1 migration

Fixes conflict between nrpe-plugin and nrpe packages by removing check_nrpe
executable from nrpe package

Add nrpe-plugin subpackage and add maintainer

fixes #364

fixes #324