disable colorizer as it swallows fails

while the colorizer is pretty, it has the problem that fail output
actually gets completely swallowed when it is turned on.

Revert the use in run_tests.sh for now until it can be sorted out
so we don't prevent people from using run_tests.sh to do development.

Fixes bug #1159116

Change-Id: I3e6dfdc03c7b033ff132c00a51a368dae9789266
Merge "disable colorizer as it swallows fails"