active item/replica item number mismatch post rebalance on 181 (total replica count is lesser than total active count*replica_factor)

Test case failing:-
swaprebalance.SwapRebalanceBasicTests.do_test,replica=2,num-buckets=2,num-swap=1

Basic swaprebalance of 1 node

Test cases failing
swaprebalance.SwapRebalanceFailedTests.test_add_back_failed_node,replica=2,num-buckets=2,num-swap=3,swap-orchestrator=True

1) Failover 3 nodes, including the orchestrator
2) rebalance them out
3) Add back the 3 node
4) Rebalance in
5) Results in data loss

Cluster @ 10.1.3.74

Seems to be regression from http://www.couchbase.com/issues/browse/MB-5193

couchbase:testrunner karan$ python scripts/ssh.py -i swap.ini "/opt/couchbase/bin/cbstats localhost:11210 all bucket-0 password |grep items"
10.1.3.74
curr_items: 15552
curr_items_tot: 46638
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 47228
ep_total_del_items: 0
ep_total_new_items: 81495
ep_uncommitted_items: 0
vb_active_curr_items: 15552
vb_pending_curr_items: 0
vb_replica_curr_items: 31086

10.1.3.79
curr_items: 13930
curr_items_tot: 41763
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 42282
ep_total_del_items: 2438
ep_total_new_items: 227195
ep_uncommitted_items: 0
vb_active_curr_items: 13930
vb_pending_curr_items: 0
vb_replica_curr_items: 27833

10.1.3.80
curr_items: 13933
curr_items_tot: 41584
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 42096
ep_total_del_items: 2488
ep_total_new_items: 224318
ep_uncommitted_items: 0
vb_active_curr_items: 13933
vb_pending_curr_items: 0
vb_replica_curr_items: 27651

10.1.3.76
curr_items: 13975
curr_items_tot: 41826
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 42377
ep_total_del_items: 2576
ep_total_new_items: 197397
ep_uncommitted_items: 0
vb_active_curr_items: 13975
vb_pending_curr_items: 0
vb_replica_curr_items: 27851

10.1.3.75
curr_items: 13702
curr_items_tot: 43174
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 43704
ep_total_del_items: 2477
ep_total_new_items: 232395
ep_uncommitted_items: 0
vb_active_curr_items: 13702
vb_pending_curr_items: 0
vb_replica_curr_items: 29472

10.1.3.77
curr_items: 13894
curr_items_tot: 38447
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 38896
ep_total_del_items: 0
ep_total_new_items: 77506
ep_uncommitted_items: 0
vb_active_curr_items: 13894
vb_pending_curr_items: 0
vb_replica_curr_items: 24553

10.1.3.78
curr_items: 13852
curr_items_tot: 38553
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 39027
ep_total_del_items: 0
ep_total_new_items: 70145
ep_uncommitted_items: 0
vb_active_curr_items: 13852
vb_pending_curr_items: 0
vb_replica_curr_items: 24701