The lightsout recover patch broke multinode mysql. Also the lightsout
recovery didnt probably pass the --wsrep-new-cluster flag. This
updates the mariadb bootstrap to work with multinode again.

Closes-Bug: #1559480
Related-Id: I903c3bcd069af39814bcabcef37684b1f043391f
Change-Id: I1ec91a8b2144930ea8f04cc1c201b53712352e4e