Dont allow copying of the FailoverTable

This will prevent us from having to copy the failover log class
in different places. We generally do not allow classes to be copied.

Change-Id: I4d4fafbe90501006963c8ba201f6dc7ebf2e464e
Reviewed-on: http://review.couchbase.org/32821
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>