Speed up of Heat provisioning via Neutron

* This fix adding one more attempt for checking of assigned floatingIP
  via neutron.
* If nova returned instance id w/o floating ip assigned savanna tries to
  find it in floating IPs assosiated with port assigned to this
  instance.
* This patch speed up Heat engine when neutron used up to 20 mins

Change-Id: Id2213d45051d7b065b1938c6d96d60b2ac28153b
Closes-Bug: #1277501
Merge "Speed up of Heat provisioning via Neutron"