Update some l3-agent log messages
Update some l3-agent log messages

A warning message in process_delete() had an unnecessary
period since the method was wrapped with exception_logger():

 "...no router namespace found.: FloatingIpSetupException..."

Also, two debug messages were not printing the router ID,
so were pretty useless.

Trivialfix

Change-Id: Ib007d81d53823b665f4f16d23c87bc887749d252

openstack/neutron,mahak/neutron,huntxu/neutron,huntxu/neutron,mahak/neutron,openstack/neutron,openstack/neutron,noironetworks/neutron,noironetworks/neutron,mahak/neutron