librdmacm

librdmacm
Have librdmacm release all libibverbs resources when the last librdmacm
structure goes away.  This allows for graceful cleanup when the libraries are
properly unloaded, which is useful for debugging application that crash or do
not cleanup all resources properly.

git-svn-id: svn://openib.tc.cornell.edu/gen1@2470 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86