fix ostf test check connect without floating IP
fix ostf test check connect without floating IP

There is ostf test "Check network connectivity from instance without
floating IP" which don't works in HA vCenter based environment after
https://review.openstack.org/#/c/122242/ was merged.

It happens, because test uses wrong node to make ssh tunnel to
instance of vm. This patch helps to test choose correct node.

Change-Id: Idb42e955b2b6322c565e080235873899b3298562
Closes-Bug: #1417167

eayunstack/fuel-ostf,mcloudv/fuel-ostf,mcloudv/fuel-ostf,stackforge/fuel-ostf,stackforge/fuel-ostf,eayunstack/fuel-ostf