Reuse oslo for is_uuid_like() implementation

In the original code, isalnum() in is_uuid_like() doesn't allow "-",
while for UUID, format like aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa should be
allowed. This patch is to reuse uuidutils's API in oslo.

Change-Id: I339974c75a32d27f8e4443a1b97bb6e410933aa4
Signed-off-by: Shane Wang <shane.wang@intel.com>
Cleanup unused local variables

This patch cleans up a few unused local variables, found with pyflakes.

Change-Id: Id65acc5d47380c7d6bfbbfe075dc23e1de30813c