Prevent nordugrid_gahp from using 100% cpu when using pthreads. #3958

When the Globus libraries are using pthreads to create real threads,
globus_poll_blocking() doesn't actually block. We should block on a
condition variable instead.
Version entry for nordugrid_gahp eating all cpu. #3958
If DNS returns EAI_AGAIN, try again #3965
Merge branch 'V8_0-branch'