[r=hduran-8],[bug=1305026] Added support for HA backups on restore
HA backups contain a set of file that reference
other state machines besides 0. Restore would
bring up the old db and agent.conf and peergrouper
would try to re-set the HA cluster.
Editing of agents.conf and deletion of some mongo
registries have been placed to set the restore as
if the machine was a single one.
There are some limitations to this version that
have been documented along with backup/restore
process overall aspects.
https://codereview.appspot.com/92320043/
R=menno.smits, natefinch