polkit: fix config install paths, use systemd-tmpfiles

All configs should be installed to /usr and tmpfiles should be used to
create and fix directory permissions instead of the ebuild's postinst.

sys-auth/polkit/files/polkit.conf

@@ -0,0 +1,3 @@
+d   /etc/polkit-1           -       -       -       -   -
+d   /etc/polkit-1/rules.d   0700    polkitd root    -   -
+d   /var/lib/polkit-1       0700    polkitd polkitd -   -

sys-auth/polkit/polkit-0.112-r2.ebuild → sys-auth/polkit/polkit-0.112-r3.ebuild

@@ -112,10 +112,15 @@ src_install() {
 
 	dodoc docs/TODO HACKING NEWS README
 
-	fowners -R polkitd:root /{etc,usr/share}/polkit-1/rules.d
+	# relocate default configs from /etc to /usr
+	dodir /usr/share/dbus-1/system.d
+	mv "${D}"/{etc,usr/share}/dbus-1/system.d/org.freedesktop.PolicyKit1.conf || die
+	mv "${D}"/{etc,usr/share}/polkit-1/rules.d/50-default.rules || die
+	rmdir "${D}"/etc/dbus-1/system.d "${D}"/etc/dbus-1 || die
 
+	systemd_dotmpfilesd "${FILESDIR}/polkit.conf"
 	diropts -m0700 -o polkitd -g polkitd
-	keepdir /var/lib/polkit-1
+	dodir /var/lib/polkit-1
 
 	if use examples; then
 		insinto /usr/share/doc/${PF}/examples
@@ -124,8 +129,3 @@ src_install() {
 
 	prune_libtool_files
 }
-
-pkg_postinst() {
-	chown -R polkitd:root "${EROOT}"/{etc,usr/share}/polkit-1/rules.d
-	chown -R polkitd:polkitd "${EROOT}"/var/lib/polkit-1
-}