Useful for upgrade etc., which is preferablly done serially.
Example usage: tools/kolla-ansible deploy OR tools/kolla-ansible upgrade
Closes-Bug: #1576708
DocImpact
Change-Id: I34b2e16f8ce53e472a4682a4738c4ac0f5abf00c
Migrate to full variable syntax in with_ loop for
manila and tempest.
TrivialFix
Partial-Implements: bp ansible2
Change-Id: Ic68fd6123f0cd5bd0035e139e89f7b569574074c