Explicitly states the keystonemiddleware version

Currently, there is no version listed. However, there exists a page for
version 0 of the library in pypi.

https://pypi.python.org/pypi/keystonemiddleware/0

This change states the version of the library to "greater than equal"
1.0.0 which is the first real version of the same.

Change-Id: I2bbee6db56e166387d34a4655996a85db9b64ad3
Merge "Explicitly states the keystonemiddleware version"