Reassign IP to vlan interface when deleting a VLAN bridge

When deleting a VLAN bridge that has an IP address assigned to it, don't delete
the VLAN interface, but reassigned the IP address back to the underlying VLAN
interface.

Closes-Bug: #1255153

Change-Id: I5e39877c0786b43eddba9b5e1394d4c2ec023c0a
NSX: Fix status sync with correct mappings

The code that syncs router status to the neutron_db was using the nsx
router id instead of the neutron router id thus synchronize_router
would never update the database.

Also, the switch synchronization routine was not fetching the
appropriate neutron id tag thus causing switch synchronization to
be skipped.

This patch also fixes the error in the unit tests which allowed for
the bug to be introduced.

Co-Authored-By: Salvatore Orlando <salv.orlando@gmail.com>
Closes-bug: 1283856

Change-Id: I26342ecea6ad546b224b7fca1e55f754b4883363
Lower log level of errors due to user requests to INFO

Errors due to bad client requests (e.g., NotFound, BadRequest)
are logged as exception/trace level and it is annoying
from the point of operators' view.
This commit changes the log level for errors due to
user requests (HTTP 4xx errors) to INFO.

Closes-Bug: #1282394
Change-Id: Ic5646333db88ce856f9366e914cf961890d30501
Rename DB models and related resources for VMware NSX plugin

This patch also introduces a DB migration to update the
affected tables, and the enum type for those DB engines that
require it.

Additions made to existing migrations are needed to ensure
that green deployments using the new plugin name will apply
the migrations correctly.

Partial-implements blueprint nicira-plugin-renaming

Change-Id: Ie0fdb51dfa399c44b749fa8345f334a2c8c29151
Merge "Reassign IP to vlan interface when deleting a VLAN bridge"
Merge "NSX: Fix status sync with correct mappings"
Merge "Lower log level of errors due to user requests to INFO"
Merge "Rename DB models and related resources for VMware NSX plugin"