main/multipath-tools: fix filepaths

multipath-tools uses $configdir compile-time option that points to
$(prefix)/etc/multipath, which is not what users generally expect.

Also OpenRC service was broken and referring to /sbin/multipathd instead of
/usr/sbin/multipathd.

main/multipath-tools/APKBUILD

 # Maintainer: Leonardo Arena <rnalrd@alpinelinux.org>
 pkgname=multipath-tools
 pkgver=0.9.4
-pkgrel=0
+pkgrel=1
 pkgdesc="Device Mapper Multipathing Driver"
 url="http://christophe.varoqui.free.fr/"
 arch="all"
@@ -21,6 +21,7 @@ options="!check"
 build() {
 	make prefix="/usr" \
 		sysconfdir="/etc" \
+		configdir="/etc/multipath/conf.d" \
 		mandir="/usr/share/man" \
 		infodir="/usr/share/info"
 }
@@ -42,6 +43,6 @@ sha512sums="
 5e0dcea610fc215e345444c04453a38f39c73e493c2bc53f6b3a90cd701266aabdf7c4693dfc321099af836d0019bf27355e265ad5db5deff48f8bb94ed4719d  multipath-tools-0.9.4.tar.gz
 e81462b22c0cbc92ea935d7544b9f9a0c4ccbcf13f3bc03dadf6de96407c9cf49964c9bbf02f12a134e1255c66421c6fde39d54b15eef975e8df81bdc88b2213  multipath-tools.conf
 97deeee57daee787d807da0a4dbf50baae047ddcda30925f7000ec822b5a17a3dc55196c3e032c8ffbc2caeac690ce5ca485b0a7c99f15e66bddaa000439112a  multipath.initd
-2f913fed199f12f048eb042b5bb1a326f6f09cfe63d572ac269461d96ebf25b251576de22be7ba9ab631ded7af6fd47dac38fda3b29d00640c806181eb37447c  multipathd.initd
+71933b27a9ed76d00766ee29e0583ccf08bd689805cf77e284bc318bae62ad7bcde1894b2e50993019462b0c9787eaa780b271244ff11ef52cca290604900343  multipathd.initd
 f5699633be498cc78ed27c222334b9e5c7271b852f9e687991e425a27db74cd9c01198792fe5fc7f5dedf47fee9b577e8c4803f5b0323b10544f3678d5c6c714  0001-Disable-Werror-and-O2.patch
 "

main/multipath-tools/multipathd.initd

 #!/sbin/openrc-run
 
 supervisor=supervise-daemon
-command=/sbin/multipathd
+command=/usr/sbin/multipathd
 command_args_foreground="-d"
 output_log=/var/log/${RC_SVCNAME}.log
 error_log=/var/log/${RC_SVCNAME}.log