BaseAuthTokenMiddlewareTest.setUp call super normally

Python has its own way of calling the super impl. Use it.

Change-Id: I3318c130ca60c6579ee9c3aecb0781a0f0f5fc32
Improve help strings

For consistency of help strings, add "." where missing, improve
capitalization in some cases.

Change-Id: I628b331b306ac606dcfdbfb55a743600e611ed7c
Remove netaddr package requirement

An auth_host with : in the name is going to require wrapping in []
because otherwise the : is confused with the port separator, so the
code doesn't have to verify that it's an IPv6 address. This allows
the removal of the netaddr package requirement.

Change-Id: I0d4c622b360769f1a7587d3c230e50d22f5b75a4
Merge "BaseAuthTokenMiddlewareTest.setUp call super normally"
Merge "Improve help strings"
Merge "Remove netaddr package requirement"