- Remove 'NEUTRON_ENABLE'
- Remove redundant configuring of 'network_provider' from tests.
Keep it only for tests where a special segment type should be
used.
- NEUTRON_SEGMENT_TYPE makes sense only if a test not configure
custom network settings. If not set - defaults from Fuel should
be used.
- nova-network is going to be removed from Fuel, so vcenter tests
are outdated because vcenter will be moving to a plugin.
Change-Id: I68c6728832569e5bc92a52ad5dd7676b6924ee48
Related-Bug:#1503752