Improve behaviour of the Galera rebuild.

Decreasing timeout down to moment of quorum creation for corosync.

Join to healthy cluster takes about 20 seconds.

Change-Id: I46b887b626269d8d8905ef78bee3b20f7d1a5e3b
Target logs to syslog after provisioning on Ubuntu

Change-Id: Ic23d9f40cecfc4264bf0fdc08108e308be24b13e
Closes-bug: #1263612