Add RemoveIPC=no to login config

The default setting of RemoveIPC=yes for systemd-logind creates problems
when non-system users (UID>1000) start daemons, which use System V
semaphores and which should keep running when they log out their
session. This is the case for postgreSQL.

Install systemd-loging drop-in configuration file which sets
`RemoveIPC=no`.

install.sh

@@ -138,4 +138,7 @@ install_data misc_systemd_units/nfsd.service             "$DESTDIR$systemdunitdi
 mkdir -p "$DESTDIR$systemdunitdir/user@.service.d"
 install_data misc_systemd_units/user@.service.d/depend-on-remote-homes.conf \
                                                          "$DESTDIR$systemdunitdir/user@.service.d/depend-on-remote-homes.conf"
+mkdir -p "$DESTDIR$sysconfdir/systemd/logind.conf.d"
+install_data misc_etc_files/systemd/logind.conf.d/disable_RemoveIPC.conf \
+                                                          "$DESTDIR$sysconfdir/systemd/logind.conf.d/disable_RemoveIPC.conf"
 exit

misc_etc_files/systemd/logind.conf.d/disable_RemoveIPC.conf

@@ -0,0 +1,5 @@
+[Login]
+# Allow non sytem-users to run daemons which use System V semaphores
+# and survive their session, e.g. postgreSQL
+#
+RemoveIPC=no