MB-8972: casper test for failover confirm dialog

Change-Id: I2b0f81c0c4dff1faec929145dde3f9d8c03d6fcc
Reviewed-on: http://review.couchbase.org/29875
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
MB-8972: fixed launch of rebalance

Change-Id: I77055eb9af6d29103cb3fb6ae4aef9e5d02afa01
Reviewed-on: http://review.couchbase.org/29876
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>