MB-11588: disable only replicaIndex checkbox
MB-11588: disable only replicaIndex checkbox

therefore hidden field will be sent to the server.

The issue occured because at bucket creation time, if replicas are
disabled, we disabled both checkbox and corresponding hidden field for
replicaIndex which triggered default for this field which was true.

Change-Id: I70401fb9575c4f64e4bc7db71e838de85089e8e3
[76658a2722cfc360b68a81107f0c193549bc08f4@tut.by: adjusted commit message to explain fix better]
Signed-off-by: Aliaksey Kandratsenka <76658a2722cfc360b68a81107f0c193549bc08f4@tut.by>
Reviewed-on: http://review.couchbase.org/39487
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

mschoch/ns_server,membase/ns_server,ceejatec/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,nimishzynga/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,mschoch/ns_server,nimishzynga/ns_server,membase/ns_server,nimishzynga/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,ceejatec/ns_server,membase/ns_server,nimishzynga/ns_server,mschoch/ns_server