ganeti.initd: include defaults file, if present

In the example init script we'll execute an optional defaults file to
make it easier to add local customizations to the ganeti startup.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin <iustin@google.com>

doc/examples/ganeti.initd.in

@@ -16,6 +16,8 @@ DESC="Ganeti cluster"
 
 GANETIRUNDIR="@LOCALSTATEDIR@/run/ganeti"
 
+GANETI_DEFAULTS_FILE="@SYSCONFDIR@/default/ganeti"
+
 NODED_NAME="ganeti-noded"
 NODED="@PREFIX@/sbin/${NODED_NAME}"
 NODED_PID="${GANETIRUNDIR}/${NODED_NAME}.pid"
@@ -34,6 +36,10 @@ test -f $NODED || exit 0
 
 . /lib/lsb/init-functions
 
+if [ -s $GANETI_DEFAULTS_FILE ]; then
+    . $GANETI_DEFAULTS_FILE
+fi
+
 check_config() {
     for fname in \
         "@LOCALSTATEDIR@/lib/ganeti/server.pem"