zhiyong.dai 26a74d4596 Add choices for option '--policy'
When creating server group, the '--policy' option is required, but
valid choice is 'affinity' or 'anti-affinity', adding multiple
policies will produce an error. This patch add choices and default
value for option '--policy', and remove the former help message.

Change-Id: I312680af384363b3e9a7de9aa1f0946643e193e2
Closes-Bug: #1662771
2016-11-27 15:32:28 +08:00
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