...for pidfile and command. They are set when using the default start
function and restored in the default stop function
(https://github.com/OpenRC/openrc/blob/master/sh/start-stop-daemon.sh).
Since we redefine start/stop functions, we should set/get them manually.

The primary motivation for this change was this:
https://github.com/jirutka/collectd-openrc/blob/d2e1beaa7325503e52d49aa9c70e27c531cd4b2b/openrc.c#L107-L113

See !27275

This is the first step to provide and allow installing multiple
major versions of PostgreSQL in parallel.

See !27275

...and remove unnecessary *_quit flags.

New variables were introduced almost four years ago.

retval was always 0 because `local` is a command on own, so after
`local out=$(...)` is executed, $? contains exit status of `local`,
not `$(...)`.

This reverts commit a17934001d49d5e78ed45eb9e74b28bb4447e78d.

I didn't expect that the sample configuration file is used in regression tests. :(

Configuration files belong to /etc, not /var/lib/. This change is
inspired by Gentoo package.

This change will NOT affect existing users, until they update their
/etc/conf.d/postgresql config to the new format without changing
conf_dir.

But keep it backward compatible with old confd.

makes postgres start again. fixes #2984

- change some variables, {NICE,RUDE,FORCE}_TIMEOUT to correspond with
  gentoo variables, while still beeing backawards compatible
- change data dir to 9.2
- patch initdb to not suggest how to start postgresql

ref #943

The pid file contains a lot of numeric stuff. The first line is the
PID, so use just 'read' to get it instead of the grep.

New feature to restore backe up databases on bootup. Helps when you run
postgresql databases from tmpfs.

and fixed misc build issues

http://bugs.alpinelinux.org/issues/show/62

A sophisticated object-relational DBMS
http://www.postgresql.org/