Remove "old-style" handle database code from aispoll.c and include
instead hdb.c/hdb.h. These files are copies of the handle database
code used for the library without mutexes.

This work for Mark Haverkamp to use the handle database functionality
as part of the event service.

BKrev: 4106e5a7ANCdXqe3zoIfO1tcYyrQhQ


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@129 fd59a12c-fef9-0310-b244-a6a79926bd2f