tree 1842222853db08e711a647f3800aaca65ad65bce
parent d88f3a34ddb50db305c201f393874e21dc89a010
author Ghanshyam <ghanshyam.mann@nectechnologies.in> 1449217636 +0900
committer Ghanshyam <ghanshyam.mann@nectechnologies.in> 1449730190 +0900

Makes microversions config option clear about 'None'

If StrOpt option is explicitly set as None, oslo config
will return it as string "None" which should be invalid
configuration.
Example-
   min_microversion = None will be end up with 'None'.

This commit makes that clear in config and raise exception
for the same.

Partially implements blueprint api-microversions-testing-support

Change-Id: I81e86faca6f8c0ffb7da22154a62236ac25cf0c0