Execute udevadm on other linux installs

When ofa and ovs neutron agents start, they use the linux utility
'udevadm'.  It is passed as an argument with an absolute directory path
which can vary on each linux install.  By removing the directory path,
it will find this utility by way of the user's environment path since
linux executables are configured in each user's path upon user creation.

Change-Id: I2344290d38c7889b8f32d8fb9c5161b09826e037
Closes-bug:  #1367697
Switch run-time import to using importutils.import_module

.. and enable the cyclic-import pylint check, now that this particular
import is invisible to pylint.

Change-Id: I9bfe7f77742b0db3ebead6a6767ade9b91e54c22
Use correct base class for unit tests for ML2 drivers

In unit tests for several ML2 mechanism drivers (listed below)
the NeutronDbPluginV2TestCase class is used instead of Ml2PluginV2TestCase
which is desired to be used.

Unit tests for ML2 mechanism drivers in neutron/tests/unit/ml2:
   drivers/cisco/nexus/test_cisco_mech.py
   drivers/brocade/test_brocade_mechanism_driver.py
   drivers/freescale/test_mechanism_fslsdn.py
   test_mechanism_ncs.py
   test_mechanism_odl.py
   test_l2population.py

Partial-Bug: #1373153

Change-Id: I9524cafb39975b1384954a2eefcbf754231d2198
Include call to delete_subnet from delete_network at DB level

Removes an extra lock in bsn plugin that causes a deadlock
when delete_subnet is invoked form delete_network, agreed
with kevinbenton to remove it
Modifies a unit test to cover this change per reviewer request
Co-author amirosh

Closes-bug: #1197176

Change-Id: Ie3414848a91cc737b16b79399ae19800545e533f
Cleanup and refactor methods in unit/test_security_groups_rpc

We had strings repeating all along the code which already were
in constant form, those have been refactored. Also global configuration
changes are now handled by functions to enhance code readability.

Change-Id: I0d4e508cda2537abe431f04a278ba2e1d2f5d97d
Update i18n translation for neutron.db log msg's

Validate that hacking rules apply to directory neutron/db
Partial-bug: #1320867

Change-Id: Iffdaa28bf5d5d503623f1f6dec4a8003f48974d8
Update i18n translation for neutron.extension log msg's

Validate that hacking rules apply to directory neutron/extensions

Change-Id: Ifbc97ae2b5670fbdf22c7d0ae48f91a7776daf01
Partial-bug: #1320867
BSN: Set inconsistency record on delete failure

Set a bad value in the consistency DB on a delete
failure so a sync is triggered the next time the backend
servers become available.

This fixes the issue where the backend servers are unavailable
when an object is deleted from ML2 but not deleted from the
backend.

Closes-Bug: #1377350
Change-Id: I24713a03af4d3499645241f900de1f572689c235
Updated from global requirements

Change-Id: Ie86ce0bd15761b237385007a7905ac1317f0bfff
Drop usage of RpcProxy from L3PluginApi

Drop the usage of the RpcProxy compatibility class from the
L3PluginApi.  The equivalent direct usage of the oslo.messaging APIs
are now being used instead.

Part of blueprint drop-rpc-compat.

Change-Id: I6639d1aa8acca8c0544020e28489e71f3d5d2955
Drop RpcProxy usage from MetadataPluginApi

Drop the usage of the RpcProxy compatibility class from
MetadataPluginApi.  The equivalent direct usage of oslo.messaging APIs
are used instead.

Part of blueprint drop-rpc-compat.

Change-Id: I1764dd715237bc76dae2789121850f69b8f82888
Merge "Include call to delete_subnet from delete_network at DB level"
Merge "Update i18n translation for neutron.db log msg's"
Merge "Update i18n translation for neutron.extension log msg's"
Merge "Cleanup and refactor methods in unit/test_security_groups_rpc"
Merge "Execute udevadm on other linux installs"
Merge "Drop usage of RpcProxy from L3PluginApi"
Merge "Drop RpcProxy usage from MetadataPluginApi"
Merge "BSN: Set inconsistency record on delete failure"
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: Ia8c01192a4c572a18bdcf987c188febb0c0a42f7