CBQE:0 Handle stat not found exception from new nodes on a rebalancing server during post_resume_validations()

Change-Id: Iea061f732ef42685ee59c9a2eda7e5262230c2bd
Reviewed-on: http://review.couchbase.org/40072
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>