Test fixture improvements

Test fixture improvements

- ensure we escape out percent signs when a CompiledSQL or RegexSQL
has percent signs in the SQL or in the parameter repr

- to support combinations, print out complete test name in skip
messages, py.test environment gives us a way to do this

Change-Id: Ia9e62f7c1026c1465986144c5757e35fc164a2b8
(cherry picked from commit 3cf0a1642eafe53e3c3b40b06cf105a32676a27f)