ubik: Introduce new address lock

ubik: Introduce new address lock

Introduce a new lock to protect:
	ubik_server->addr[]
	ubik_server->disk_rxcid
	ubik_server->vote_rxcid
	ubikSecClass
	ubikSecIndex

Globals are put into a new addr_data structure along with the lock.

Based on analysis and design work from Jeffrey Hutzelman.

Change-Id: I33ef58a36e87a3925b310052f83bb3c6dd60d785
Reviewed-on: http://gerrit.openafs.org/4157
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>