CBQE-1595: add views to upgradeXDCR, add postupgrade ops

Change-Id: I1498f20d1ec2510b62e6896338505a6e9cd47697
Reviewed-on: http://review.couchbase.org/29827
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>