Fix non-synchronized removal of pending assignments from pending map in UniqueId
Also fix a bug where errors may leave an entry in the pending assignments map

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Fix missing name field set call in UIDMeta when loading an object
Avoid CAS errors in UIDMeta by simply returning the original byte array
Don't write the "name" or UID fields to storage for UIDMeta objects as the
canonical name is stored in the uid -> name mapping column. Note that this may
require a purge/resync for RC1 users.

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>