Added TAP_DEVICE_PREFIX info to common/constants

Change-Id: Ia84629732490585164237ca4f7d1db90bde9fbf2
Closes-Bug: 1361573
Rework and enable VPNaaS UT for Cisco CSR REST

The Cisco CSR REST client library unit tests were developed in
Icehouse, using the httmock library. However, the community did
not want to add this library to global requirements, as there was
a similar httpretty library available (albeit with some short-
comings). As a result, the test module was renamed with a "no"
prefix, to prevent inclusion in automated tests.

Since then, a new library, requests-mock, has been added to global
requirements, to replace httpretty, and is being used on several
other projects.

This commit reworks the unit test to use requests-mock, instead of
httmock. The functionality is the same, but the mechanism (a
fixture with URI registration vs context manager) is different.

This commit provides coverage for the REST client code, by using a
mock for the Cisco CSR VM. The unit test module can be subclassed,
and used with a real CSR VM, for 3rd party CI testing, in the
future.

Change-Id: I55c8a253eb32985bc2016ae748b1ded58d021e1a
Closes-Bug: 1358470
DVR to delete router namespaces for service ports

Earlier merge that enabled LBaaS in DVR with review #114141
had not covered the removal of DVR router namespace on
VIP Port deletion in ml2 plugin.

Here we fix the ml2 plugin to attempt namespace removal for
all dvr serviced ports.

Change-Id: Ie7930ebedb12212886d45294132fefff7296e104
Closes-Bug: #1364839
Use dict_extend_functions to populate provider network attributes

Use dict_extend_functions mechanism to handle populating additional
provider network attributes into Network model in Nuage plugin.

Change-Id: I72e5afe3d03ae223fcd8e75f1f4f07624c3a7daf
Closes-Bug: #1362308
Mock out all RPC calls with a fixture

Mock out the rpc proxy calls used by various agents to
prevent unit tests from blocking for 10+ seconds while waiting
for a timeout. This happened with the OVS agent unit tests
recently in Change-ID Idd770a85a9eabff112d9613e75d8bb524020234a.

This change results in a reduction from 330.8 seconds to 2.7 seconds
for the neutron.tests.unit.openvswitch.test_ovs_neutron_agent
test module.

Closes-Bug: #1372076
Change-Id: I5e6794dc33c64c8fe309d8e72a8af3385c7d4442
Merge "Rework and enable VPNaaS UT for Cisco CSR REST"
Merge "DVR to delete router namespaces for service ports"
Merge "Added TAP_DEVICE_PREFIX info to common/constants"
Merge "Mock out all RPC calls with a fixture"
Merge "Use dict_extend_functions to populate provider network attributes"