Avoid ip/fqdn weirdness & use fsid path for keys
keys are now copied from the first available mon host

since we're now using fsid for the directory name, it should be safe to
just copy the keys from all mon hosts. Once they are copied, the rest of
the hosts will just skip copying. :)
Merge pull request #76 from AcalephStorage/fetch-fsid

Removed dependency on mon[0]