Support for SSL in wsgi.Server

SSL are entirely optional. Support for SSL as well using code from glance. We
have some new options for configuring the SSL support. There are tests for
accessing a sample app w/o ipv6 or ssl, one with just ssl and one with
ipv6 and ssl

Fixes LP# 1101342

DocImpact

Change-Id: I824acef4130d27828dcf199736b3ca668d6202d7
Add VIRTUAL_ENV key to enviroment passed to patch_tox_env

Bug 1161413

Change-Id: I873d90c148c2adf15319faeb6290743eda2d52aa
Merge "Add VIRTUAL_ENV key to enviroment passed to patch_tox_env"