Integration tests related changes

* Neutron related code was changed for support Savanna with Heat;
* Now file itest.conf.sample-full looks like file savanna.conf.sample-full;
* File itest.conf.sample was changed to provide easiest launch of integration tests.

Change-Id: I208a89fdd1c68200528bf99428d83946fc0d075a
Merge "Integration tests related changes"