Modify neutron loadbalancer resource based on Neutron V2.0 LBaaS Extension

Current Neutron Loadbalancer resource is not in-line with Neutron v2.0 API LBaaS Extension(http://docs.openstack.org/api/openstack-network/2.0/content/lbaas_ext.html ). I am not sure whether the current implementation works with Neutron v2.0 API.

LBaaS Extension includes the following resources:

vip, is the primary load balancing configuration object that specifies the virtual IP address and port on which client traffic is received.

pool, a load balancing pool is a logical set of members, such as web servers, that you group together to receive and process traffic.

member, a representation of the application running on back end server.

health_monitor, which is used to determine whether or not back end members of the pool are usable for processing traffic.

Resources available in the current implementation are:

OS::Neutron::HealthMonitor': HealthMonitor,
        'OS::Neutron::Pool': Pool,
        'OS::Neutron::PoolMember': PoolMember,
        'OS::Neutron::LoadBalancer': LoadBalancer,

There are number of issues

Assuming OS::Neutron::LoadBalancer': LoadBalancer maps to the 'vip' resource, 'protocol' property (which is required) is missing.

Also, there is no 'subnet_id' property.

Aim is to make it consistent with the API and add some unit tests to it.