Fix Incorrect Tracking of Vbuckets during XDCR
Fix Incorrect Tracking of Vbuckets during XDCR

The actual number of vbuckets currently replicating were being
incorrectly tracked as we weren't accounting for those vbuckets for
which triggering couch replication failed. This change set fixes this
problem in both the start_xdc_replication() and
maybe_adjust_xdc_replication() functions.

Change-Id: Ie2c803bcdf448b44b2332fbf63f2859cbd4a9015
Reviewed-on: http://review.couchbase.org/10466
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

nimishzynga/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,mschoch/ns_server,daverigby/ns_server,ceejatec/ns_server,daverigby/ns_server,pavel-blagodov/ns_server,membase/ns_server,vzasade/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,ceejatec/ns_server,daverigby/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,nimishzynga/ns_server,membase/ns_server,vzasade/ns_server,membase/ns_server,membase/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,daverigby/ns_server,vzasade/ns_server,ceejatec/ns_server,ceejatec/ns_server,daverigby/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,vzasade/ns_server,membase/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,membase/ns_server,nimishzynga/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,ceejatec/ns_server