Remove pyudev dependency

pyudev was only used by the linuxbridge-agent to get the list
of virtual network devices. This can be got from /sys instead.
This patch fixes the problem where testr could not import the
lb-agent module because pyudev was not in requirements.txt.

Change-Id: I0a78c91e97de4413f2ecf6fb56d2ff61b36baa78
Closes-Bug: 1269040
Implement Mellanox ML2 MechanismDriver

This commit adds support for currently provided Mellanox Plugin
embedded switch functionality as part of the VPI (Ethernet/InfiniBand)
HCA as an ML2 MechanismDriver.
MechanismDriver adds support for VNIC_DIRECT and VNIC_MACVTAP vnic types.
MechanismDriver provides configurable default vif_type for neutron port created
with default VNIC_NORMAL vnic type till nova api support for vnic_type is available.

Implements blueprint mlnx-ml2-support

Change-Id: I16ad318f095b7af879e1b99dcc7f5f9e92facd2b
Fix NVP/Nicira nits

Some references to NVP or Nicira went overlooked during
the rebranding exercise. This patch kills the last ones.

Implements blueprint nicira-plugin-renaming

Change-Id: I9f5e4f38246adbd6f821310a0bcfc3ad40c3ad38
replace rest of q_exc to n_exc in code base

The following patch renames the rest of q_exc to n_exc which were
left when quantum was renamed to neutron.

used: find . -name "*.py"  -print | xargs sed -i 's/q_exc/n_exc/g'

Change-Id: I04041030694b28c400b6c9c552433f2eaa4a37ba
Closes-bug: #1287462
Different class names for VPNaaS migrations

In migrations 52ff27f7567a_support_for_vpnaas.py and
338d7508968c_vpnaas_peer_address_.py different class names are set:
neutron.services.vpn.plugin.VPNDriverPlugin and ne
utron.services.vpn.plugin.VPNPlugin.

Closes-bug: #1285641

Change-Id: Ieda8d3a8a022179867010b6e47d09cf7f43f5da9
Imported Translations from Transifex

Change-Id: Ie6efde5d61d0c500fbbc45d715f605f4c316d166
Merge "Fix NVP/Nicira nits"
Rename migration lb_stats_needs_bigint to match revision number

This patch renames the migration 77dfe0962bb3_lb_stats_needs_bigint so
that it matches the revision number abc88c33f74f_lb_stats_needs_bigint

Change-Id: If07fd5d0cec3e37e7dfb0c1e71dedc111d7870be
Merge "Rename migration lb_stats_needs_bigint to match revision number"
Merge "replace rest of q_exc to n_exc in code base"
Merge "Imported Translations from Transifex"
Merge "Implement Mellanox ML2 MechanismDriver"
Merge "Different class names for VPNaaS migrations"
Merge "Remove pyudev dependency"