selftests/futex: Check ANSI terminal color support

Because test for color support of the running shell does not aware ANSI
type terminals, it does not print colorful messages on some environemnt.
This commit modifies the test to aware ANSI type terminal, too.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>