sorcery.c: Minor optimizations.

* Remove some unused parameters from internal functions:
sorcery_wizard_create()
sorcery_wizard_update()
sorcery_wizard_delete()

* Created the struct sorcery_observer_invocation ao2 object without a lock
since it is not needed in sorcery_observer_invocation_alloc().

* Cleanup generic ao2 container sorcery object id hash, sort, and cmp
functions.

Change-Id: Iff71d75f52bc1b8cee955456838c149faaa4f92e