log: Rename access and events logs

Addresses the issue that logrotate would rotate access and event
logs, even though these are automatically rotated by dCache. This
patch renames access-<domain>.log to <domain>.access and
events-<domain>.log to <domain>.events.

Target: trunk
Require-notes: yes
Require-book: yes
Request: 2.7
Acked-by: Christian Bernardt <christian.bernardt@desy.de>
Patch: http://rb.dcache.org/r/6261/