Support condition for output

Provides output condition for cfn/hot templates,
if the condition of output evaluates to false, will
set output value to None.

Change-Id: I0398e39541a4176ef5699331c10536c59f1cb3e7
Blueprint: support-conditions-function
1 file changed
tree: e37b0c24ef2ea31cdeb5a2d709dee7e087f0790a
  1. common/
  2. functional/
  3. scenario/