Attempt to automatically save DNA ranges when a master is removed.
This is done by trying to find a master that does not yet define
a DNA on-deck range. If one can be found then the range on the deleted
master is added.
If one cannot be found then it is reported as an error.
Some validation of the ranges are done to ensure that they do overlap
an IPA local range and do not overlap existing DNA ranges configured
on other masters.
http://freeipa.org/page/V3/Recover_DNA_Rangeshttps://fedorahosted.org/freeipa/ticket/3321
This adds two new commands to ipa-replica-manage: list-ruv & clean-ruv
list-ruv can be use to list the update vectors the master has
configugured
clean-ruv can be used to fire off the CLEANRUV task to remove a
replication vector. It should be used with caution.
https://fedorahosted.org/freeipa/ticket/2303
