Pass serializer to oslo.messaging Notifier

oslo.messaging has a workaround [1] that requires context to be
transformed to pure dict before passing into amqpdriver.

Renamed serializer class to reflect its broader usage.

Updated FakeNotifier to expect serializer and other keyword arguments
supported by oslo.messaging Notifier class.

[1]: oslo/messaging/_drivers/amqpdriver.py#L337

blueprint oslo-messaging

Closes-Bug: #1332412
Change-Id: I7e7658d03639afae7bf6d3ad71445cb5b6459c09
Revert "Check NVP router's status before deploying a service"

This reverts commit 25103df197c1f366eac8dd3069fabc01d3bd18e9.
Since it always leads to an gate failure filed on https://bugs.launchpad.net/neutron/+bug/1332502 although can't find the reason until now.

Change-Id: I45cb2b5b82b421c016dcc9603b04edb638ff84cf
Imported Translations from Transifex

Change-Id: I94beb2180703a323d6751df9b31602f6f88eb340
Merge "Imported Translations from Transifex"
Merge "Revert "Check NVP router's status before deploying a service""
Merge "Pass serializer to oslo.messaging Notifier"