FIX: Use RegressionTestImage instead of InteractorEventLoop

The hypothesis is that InteractorEventLoop was not creating
the OpenGL context in time for glew to find extensions for.

Change-Id: I5b7df0c5b1cbac4e7da8d30d60963a6b1158b122
FIX: Disable new volume rendering tests for old mapper

Change-Id: Id3b05fe548873ea43f51fa2097550a334e8538c2
Merge topic 'new_volumerendering_tests' into master

d2cd5d74 FIX: Disable new volume rendering tests for old mapper
9d74a3ef FIX: Use RegressionTestImage instead of InteractorEventLoop