One Convergence: Skip all tests with 'v6' in name

Adds a check to the test setup for the One Convergence tests
to look for v6 in the name of the test and skip it if present.
This prevents IPv6 developers from having to explicitly skip
each new IPv6 test in the One Convergence unit tests until the
plugin gains IPv6 support.

Closes-bug: #1361366
Change-Id: I5c17d7290302597d5c85ef2c1df95f4f71e1a69b
Merge "One Convergence: Skip all tests with 'v6' in name"