[cern] Add master_availability_zones label

Spyridon Trigazis requested to merge multi-master-azs into cern/train

master_availability_zones is a comma_delimited_list of availability_zones. master-0 gets az master_availability_zones[0], master-N gets az master_availability_zones[N].

If the labels availability_zone is set all nodes (master and worker) will use this availability zone, for backwards compatibility.

closes #1 (closed)

Change-Id: I5c7c0b0819fe350dce58ab8175466eda9e285c8e Signed-off-by: Spyros Trigazis spyridon.trigazis@cern.ch

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