CBQE-0: updated _wait_flusher_empty and _verify_item_count to have master node as argument. Received below error caused no verification on cluster:

[2014-06-12 00:12:38,705] - [xdcrbasetests:570] WARNING - No bucket(s) found on the server ip:10.1.3.97 port:8091 ssh_username:root

Change-Id: I637279081527ef963f16b52d8e700f6826de1aec
Reviewed-on: http://review.couchbase.org/38173
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>