[Openais] [openais whitetank] add refcounting to lib_init_fn and lib_exit_fn of cpg service

[Steven Dake]

The cpg service stores a copy of conn_info for distribution of multicast
messages and configuration change messages.  It is possible that cpg can
access this conn_info structure after it has been freed.  This patch
locks the ipc connection into memory until lib_exit_fn has been called
(and the conn_info structure has been deleted from the internal cpg
distribution list).

Regards
-steve
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