Mariadb: Add logging output to wsrep-recover on startup

This PS adds logging output to the wsrep-recover function in the
mariadb startup script.

Change-Id: I98ea214852a0b54440b1ceeea363017397afcb52
Signed-off-by: Pete Birley <pete@port.direct>

mariadb/templates/bin/_start.py.tpl

@@ -503,6 +503,8 @@ def update_grastate_on_restart():
                     stderr=subprocess.PIPE)
                 out, err = wsrep_recover.communicate()
                 for item in err.split("\n"):
+                    logger.info(
+                        "Recovering wsrep position: {0}".format(item))
                     if "WSREP: Recovered position:" in item:
                         line = item.strip().split()
                         wsrep_rec_pos = line[-1].split(':')[-1]