Remove call to inexistent unfubar_testtools function

The function was removed here I5554514dd862a2004454daf295abbcf9cf9f2bfb
and since icehouse is not target in grenade job the call it's no longer needed
here we can remove it - wasn't causing any big issue besides a 'command
not found' but at least closes a bug.

Change-Id: Ib7560bb4f19d4593b5958b1f94a462c09a23cee7
Closes-bug: #1356178
(cherry picked from commit 40f30d3d51a5cd53d9c34b11adc598ba5675fe50)