gt: tests: Add gadget enable/disable commands parsing tests
gt: tests: Add gadget enable/disable commands parsing tests

Change-Id: I422e42e30fec9aeb019b6cb357a0165d647ac6d7
Signed-off-by: Pawel Szewczyk <1691dcf8dab804b326e5e4b9ab228a1c3b23a2f2@samsung.com>

kopasiak/gt,kopasiak/gt