py33: uuid verification in find_resource()

1. strutils.safe_encode() return "bytes" in py33.
2. find_resource() makes use of uuid.UUID() to verify the given
uuid argument, uuid.UUID() will trigger TypeError when input is
"bytes".

so, decode the bytes before uuid.UUID() while run in Python 3.

Close-bug #1232445

Change-Id: I504be7b43236b3a4843655706385e506cd559e4e
Merge "py33: uuid verification in find_resource()"