CBQE-1141: Cbrecovery tests P(0)

- Default bucket support for now
- Failover/autofailover cases included
- fail_count and add_count determine no.
to be failed and no. to replace them with
- failover_reason for autofailover for the
reason to failover: stop_server or firewall_block

Change-Id: I31c2c277a011e758f7a8d5c95682ae5571f76da1
Reviewed-on: http://review.couchbase.org/25750
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: abhinav dangeti <abhinav.dangeti@gmail.com>