Make common_tests work with new auto-failover.
Make common_tests work with new auto-failover.

All tests of the auto-failover common_tests suite now pass
on the new implementation of autp-failover.

Change-Id: I609d3f9fd0e0eb8e4bf7dc59fff145133a2f9821
Reviewed-on: http://review.couchbase.org/7728
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>

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