With DVR routers, if a port is associated with a FloatingIP,
before it is used by a VM, the FloatingIP will be initially
started at the Network Node SNAT Namespace, since the port
is not bound to any host.
Then when the port is attached to a VM, the port gets its
host binding, and then the FloatingIP setup should be migrated
to the Compute host and the original FloatingIP in the Network
Node SNAT Namespace should be cleared.
But the original FloatingIP setup in SNAT Namespace was not
cleared by the agent.
This patch addresses the issue.
Change-Id: I55a16bcc0020087aa1abe76f5bc85cd64ccdaecd
Closes-Bug: #1796491
cd0cc47a6a