*) convert fs/lock.c to use APR UUIDs for the opaque locktokens.

*) blow away opaquelock.c and dav_opaquelock.h since direct use of APR UUIDs
   is quite easy.
*) toss the uuid_state from the per-server config in mod_dav.c


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86413 13f79535-47bb-0310-9956-ffa450edef68