util: Remove unnecessary uuid_mem* macros

util: Remove unnecessary uuid_mem* macros

Once upon a time, in a galaxy far far away, uuid used bcmp and bcpy
operations in kernel space. However, we changed that back in 2001, and
since then the uuid_memcpy and uuid_memcmp macros have been redundant.
Tidy up the code a little by removing them.

Change-Id: I3abcff79b36a330f1619c3d7e0a791eac1cf69a1
Reviewed-on: http://gerrit.openafs.org/4253
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>