BGP Dynamic Routing

First approach.
Remove mock package from the dependencies

This patch removes mock package from the import statements in the
dynamic routing code because the mock package is the test dependency.

Signed-off-by: Taku Fukushima <tfukushima@midokura.com>
Merge branch 'bp/bgp-dynamic-routing' of https://github.com/tfukushima/neutron into tfukushima-bp/bgp-dynamic-routing

Conflicts:
	neutron/extensions/dr_agentscheduler.py
	neutron/extensions/dynamic_routing.py
	neutron/services/dynamic_routing/plugin.py
Merge branch 'tfukushima-bp/bgp-dynamic-routing' into bp/bgp-dynamic-routing