Added support for NOS version 4.1.0, 5.0.0 and greater

NETCONF temaplates for NOS version greater than 4.1.0 are slightly
different (argh). An init time check of the NOS version is done
to enable selection of the correct NETCONF templates.

Change-Id: I01e82ad402fbbb25d92a99a3325ca2608dd514cb
Closes-bug: #1332719
ofagent: Handle device name prefixes other than "tap"

This fixes regressions in commit 9d13ea884bff749b3975acb5eb5630e5aca4a665.

Handle device name prefixes other than "tap".
For example, nova hybrid interface driver uses "qvo" prefix.

Also, ignore non neutron ports correctly.  For example, veth pairs
used to connect physical bridges.

Closes-Bug: #1341465
Change-Id: I1d71c8a2cf8c2f71f0dbcfb54c9b347e24c03562
Fixes port update failure when device ID is not updated

The updation was failing because the changed_device_id variable
was undeclared.This fix declares the variable with a default value
at the beginning of the method.

Change-Id: I06dfea1170a6b2a649f4e1efe4bf70b7cee0eacb
Closes-Bug: 1337787
VPNaaS Cisco REST client enhance CSR create

For the create of the REST client object that represents a Cisco CSR,
all of the info needed were passed in as separate parameters. This
change just uses a dict instead, so that additional parameters can
be added w/o changing the API.

Updated the currently unused UT module, just so that it can be used
locally and stays up-to-date until it can be converted to use the
new requests-mock package.

Change-Id: I5d4f439cc7ffe125cea9ed3407b70645587a739a
Closes-Bug: 1336478
Add L3 Extension for Distributed Routers

This patch introduces the model and extension
framework for implementing distributed virtual
routing on top of Open vSwitch.

A new admin-only 'distributed' (as opposed to a
'centralized' or legacy-mode) attribute is added
to the API router resource. It is possible to convert
an existing (centralized) router to a distributed
one; the opposite conversion, even though allowed by
the API, may not be honored by the underlying
plugin implementation and an appropriate error will
be reported.

When creating a router (regardless of the user role),
Neutron will rely on a system wide configuration, whose
default currently allows to create 'centralized' routers.

Tests are added for basic unit coverage; when the first
building blocks for neutron-testing-refactor
are complete, functional testing will be added.
This is because we should be moving away from how
extension tests have been done up until now.

Partially-implements: blueprint neutron-ovs-dvr

DocImpact

Change-Id: I7227fbe2718eba6665a5afb5dcaaaa77b341091f
Authored-by:    Swaminathan Vasudevan <swaminathan.vasudevan@hp.com>
Co-Authored-By: Armando Migliaccio <armamig@gmail.com>
Big Switch: Remove consistency hash on full sync

Clears the consistency hash before performing a full
backend synchronization. Since all of the data is being
replaced, there is no reason to include this and it
currently requires special-casing to handle.

Closes-Bug: #1328233
Change-Id: Iace766d869dc78b041d3a5464e728b872c8347c2
Merge "Add L3 Extension for Distributed Routers"
Merge "Fixes port update failure when device ID is not updated"
Merge "Added support for NOS version 4.1.0, 5.0.0 and greater"
Merge "Big Switch: Remove consistency hash on full sync"
Merge "ofagent: Handle device name prefixes other than "tap""