This component proxies notification messages up to the HNP. This
component runs in both the HNP and non-HNP processes for ease of
selection (e.g., so you can "--mca notifier hnp" (vs. "--mca
notifier hnp,non_hnp"). It auto-detects where it is running and
does the Right Thing -- if it's in the HNP process, it sets up to
receive incoming proxied messages. If it's not in the HNP, then it
proxies all messages to the HNP.
This commit was SVN r23156.
