Boden R fea8bb64ba Expose/Improve callback notification interface ...

This patch builds a small hierarchy of event objects that
represent the payload for callback notification events. The
overall goal of this work is to begin moving away from the
existing unstructured  **kwargs passed today and standardize
on a common set of event payload objects; the beginning of such
contained herein.

A PoC/dummy patch for neutron is provided in [1] that exemplifies
consumption of the new API by:
- Removes neutron.callbacks and moves all uses to
neutron_lib.callbacks.
- Neutron uses of callbacks for BEFORE_RESPONSE events
now use neutron-lib.
- Neutron uses of callbacks for ROUTER and PROCESS
resource events now use neutron-lib.
- Neutron UTs updated to pass with this patch.

For existing discussion on this approach please see [2][3].

Co-Authored-By: Armando Migliaccio <armamig@gmail.com>

[1] https://review.openstack.org/400404/
[2] https://review.openstack.org/#/c/345718
[3] https://review.openstack.org/#/c/342304

Change-Id: If76457b1f0d5d3479e394d0dba3b22a90928f0f2

2017-01-11 13:47:12 -07:00

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