Create /var/run/ganeti before noded startup

The /var/run directory can be a tmpfs mount, so even if we make it at
install time (or include it in the package) it can go away. Therefore,
test for its existence and create it in the startup script.

Reviewed-by: imsnah

doc/examples/ganeti.initd.in

@@ -17,6 +17,7 @@ NAME=ganeti-noded
 NODED=@PREFIX@/sbin/ganeti-noded
 MASTER=@PREFIX@/sbin/ganeti-master
 SCRIPTNAME=@SYSCONFDIR@/init.d/ganeti
+RUNDIR="@LOCALSTATEDIR@/run/ganeti"
 
 test -f $NODED || exit 0
 
@@ -55,6 +56,7 @@ case "$1" in
     start)
         log_daemon_msg "Starting $DESC" "$NAME"
         check_config
+        test -e "$RUNDIR" || mkdir -p "$RUNDIR"
         if start-stop-daemon --start --quiet --exec $NODED; then
             log_end_msg 0
         else