Quantum Floating IP support

blueprint quantum-floating-ip

This commit allows OpenStack dashboard users to use Quantum floating
IP feature directly using Quantum API rather than Nova Proxy.
By this users can associates a floating IP per virtual NIC.

blueprint nova-net-quantum-abstraction

This commit defines an abstract class in api/network.py.
This class provides common interfaces related to network features
duplicated in Nova and Quantum. A concrete class to handle operations
should be defined in api/nova.py or api/quantum.py.

Change-Id: I780356a9f41e72e32ce1877d390ac7f99e96899c
Re-enable client logging.

The log level setting got moved before the local conf import,
thereby making it impossible to actually set the log level to
debug. This moves it back to the correct ordering.

Change-Id: I7b6c17350add058215c8dd3e3dd7351df64a544a
Merge "Re-enable client logging."
Merge "Quantum Floating IP support"