Updated openstack/openstack
Project: openstack/neutron  5ba1dae2d1f7cf902b28c35299aae97c8c76164c

ofagent: Ignore unknown l2pop entry removals

l2pop can send us entry removal without the corresponding addition.
Gracefully ignore it instead of crashing.

Closes-Bug: #1357198
Change-Id: I5a0cc44ba62faf15d6fe3730a9532a3826647820