MB-8430: retry to create rest con for ejected nodes

Change-Id: I67d50afc7614062aecd9343f0f93fdba239bfdec
Reviewed-on: http://review.couchbase.org/26900
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>
CBQE-0: get stats if _verify_all_buckets failed

Change-Id: I8d673d0ef653f0d64f851cba36af696c7ec4814b
Reviewed-on: http://review.couchbase.org/26901
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>
MB-8440: added debug logs for create_connections_test

Change-Id: Ia67ae65e6b2c897b119af0ca8dd8c12d05aeb35e
Reviewed-on: http://review.couchbase.org/26904
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>
CBQE-0: handle ServerUnavailableException in delete_all_buckets_or_assert

Change-Id: I28c581f9c19ba20ae23a94b7f94b7a618a2435c0
Reviewed-on: http://review.couchbase.org/26906
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>