Mick Thompson 4c1482b999 Added serial option to site.yml.
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
2016-09-13 09:26:51 +00:00
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