Fix ML2 Plugin binding:profile update

The current fix changes the logic for binding:profile
update. The binding:profile should be considered as changed
once it is present in the port attributes and differs from
existing binding:profile. The specified binding:profile with
None value should be treated as request to clear binding:profile.

Change-Id: Ibda9a1beec697fbee5be0ee379349035c3626509
Closes-Bug: 1338202
Move ARP responder test to sanity command

Additionally, the patch improves the check itself:
To check if the currently installed OVS supports the ARP responder
feature, we try to add a flow that references an OpenFlow ARP
extension via ofctl. The test may fail due to an (expected)
Runtime error, or due to some other unexpected error.
In such a case the error was previously masked and tossed away.

* Clean up ARP responder unit test
* Extract ARP responder flow actions to be used by the unit
  tests, functional test as well as the ARP responder code itself

After this patch, if the sanity check returned False but the
user never ran it or ignored its results, the OVS agent will
output errors to the log every time an ARP entry is (attempted)
to be added or removed from the flow table.

Closes-Bug: #1323718
Change-Id: I428c954d6561cd398a1e580804a9482969a154af
Do not schedule network when creating reserved DHCP port

If device_id is DEVICE_ID_RESERVED_DHCP_PORT, do not schedule
network nor notify to dhcp-agent.

Closes-Bug: #1327000
Change-Id: Idf88767596bf0fc31bf856a423d35cb1575b57f3
Add L3 Scheduler Changes for Distributed Routers

This patch implements the L3 Scheduler changes for the
Distributed Virtual Routers.

Partially-implements: blueprint neutron-ovs-dvr

Change-Id: I407c3d639ebdf885b1418bceac7cfc251e7eba1f
Co-Authored-By: Carl Baldwin <carl.baldwin@hp.com>
Co-Authored-By: Armando Migliaccio <armamig@gmail.com>
Merge "Fix ML2 Plugin binding:profile update"
Merge "Add L3 Scheduler Changes for Distributed Routers"
Merge "Move ARP responder test to sanity command"
Merge "Do not schedule network when creating reserved DHCP port"