Forbid update of HA property of routers

While the HA property is update-able, and resulting router-get
invocations suggest that the router is HA, the migration
itself fails on the agent. This is deceiving and confusing
and should be blocked until the migration itself is fixed
in a future patch.

Change-Id: I4171ab481e3943e0110bd9a300d965bbebe44871
Related-Bug: #1365426
Closes-Bug: #1378525
(cherry picked from commit 1fd7dd99ca7e5e9736200360aa354cada7fb43ff)
Remove two sets that are not referenced

The code no longer references the updated_routers and removed_routers
sets.  This should have been cleaned up before but was missed.

Closes-bug: #1232525

Change-Id: I0396e13d2f7c3789928e0c6a4c0a071b02d5ff17
(cherry picked from commit edb26bfcddf9d9a0e95955a6590d11fa7245ea2b)
Merge "Forbid update of HA property of routers" into proposed/juno
Merge "Remove two sets that are not referenced" into proposed/juno
Use the tarball's version of setup.cfg

setup.py sdist actually re-writes the setup.cfg using RawConfigParser
when it appends the egg-info section. This changes the whitespace
and breaks downstream patches to setup.cfg.
remove runtime dependency on pbr