Use uuid instead of uuidutils

Each project should directly use the standard uuid module.
uuidutils will be deprecated/removed in this cycle.

This patch replaces every uuidutils.generate_uuid() with
str(uuid.uuid4()) and uuidutils.is_uuid_like()
with utils.is_uuid_like().

Change-Id: I43642d4f1e137c14134b3d544e367b504b9851ac
Closes-Bug: #1253497
Merge "Use uuid instead of uuidutils"