gt: tests: Add colours for OK and FAILED
gt: tests: Add colours for OK and FAILED

Change-Id: If2c45fbe2002aeedf58e4fb942cdd5696fb65c3e
Signed-off-by: Krzysztof Opasiak <8064eda6f94b3817252b7d7649cf754592f63500@samsung.com>

kopasiak/gt,kopasiak/gt