cluster_cp_mode
When we lose majority, stop the applications and wait for the cluster to come back.
Filter out all those events that look like:

=INFO REPORT==== 27-Feb-2013::14:17:46 ===
    application: mnesia
    exited: stopped
    type: temporary

since they are not very interesting and this bug makes them appear to a highly verbose extent.
Base the whole thing off net_adm:ping/1 - because we might see other nodes come back but also be waiting (in the no-majority case, and RAM nodes). Better to detect they exist and come back than to stay stuck because they don't happen to be running Mnesia.
Simplify
We no longer need two different death detectors since we no longer look at Mnesia for majorityness.
Rename this thing, to make space for bug 25471
Merge default
Merge in default (umm, again)
We don't need this - net_adm:ping/1 will not return pong for nodes that have gone down before net_ticktime expires (it will hang for until then instead).
Unused variable
Register the process name to make sure we only have one running at a time.
Merged bug25358 into default