Move to newer version of python-swiftclient

The 2.0.x release of python-swiftclient includes SSL certificate
verification. This is desired for https://review.openstack.org/#/c/75927/

Change-Id: I3d6371a31c07c4e31da72edf9dd71537c8e58d23
Exclude netifaces versions 0.10.0, 0.10.1

Add pin on netifaces dependency to exclude versions
0.10.0 & 0.10.1, as these versions fail to install on
sereval Linux distributions.

Change-Id: I4e5d210ed6cf5fcf5612e8600d3b144a4620034c
Related-to: #1315374
Bump sqlalchemy-migrate version to 0.9.1

The latest version of sqlalchemy-migrate has support for sqlalchemy 0.9
and DB2.  Several core projects are supporting DB2 already so we should
bump the runtime requirement so the migrations work if you're running
against a DB2 backend.

This is also needed for oslo.db commit 567175554 to clean old migrate
monkey patches out of oslo.db since they live in migrate 0.9.1 now.

Related blueprint db2-database

Change-Id: Iadb4a5dd67d7e4e5547b7185159ab687a4ef1b74
Merge "Bump sqlalchemy-migrate version to 0.9.1"
Merge "Exclude netifaces versions 0.10.0, 0.10.1"
Merge "Move to newer version of python-swiftclient"