MB-19412: cancelTabsSpecificQueries during navigation in app.admin.**
MB-19412: cancelTabsSpecificQueries during navigation in app.admin.**

This part was mistakenly removed. We miss this for so long because
most part of queries wrapped in mnPoll which has its own cancellation.

Change-Id: Ie71a08f3d45f264e8f99d04a203f519fd3f88fd6
Reviewed-on: http://review.couchbase.org/63572
Reviewed-by: Pavel Blagodov <596b71e626fc58dbdad141b817770e3e4810bb9b@gmail.com>
Tested-by: Pavel Blagodov <596b71e626fc58dbdad141b817770e3e4810bb9b@gmail.com>
Reviewed-by: Dave Finlay <7b10a9ed9f70e64c30b07607a671ae61c33f14c8@couchbase.com>
Tested-by: Dave Finlay <7b10a9ed9f70e64c30b07607a671ae61c33f14c8@couchbase.com>

membase/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server