fix nvp version validation for distributed router creation

Fix typo on major version. This was not caught during unit tests
so adds a few to ensure this does not regress.

Fix bug #1243862

Change-Id: Ie136aaa504939d8ac77dda07e3f955aed8c233f9
(cherry picked from commit 9eb06332f0292ed4db7b322e483167cb40740d6e)
Merge "fix nvp version validation for distributed router creation" into stable/havana