Eric Brown e09989d5aa Use config choices for replication_mode option
The oslo.config module permits using a choices parameter to specify
the list of valid values for a particular option.  The
replication_mode mode can utilize this parameter and allow the
removal of some validation checking code.

Change-Id: I77baec69717019664e71ae2fd24be8e1d908374b
2015-11-20 13:15:54 -08:00
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