Redfish

- Added support for leveraging the 'HTTP_PROXY' and 'HTTPS_PROXY' environment variables to set up proxy information

- Removed urlparse2 dependency
- Updated jsonpatch requirements; jsonpatch 1.25 dropped Python 3.4 support

- Added fallback to using '/redfish/v1/SessionService/Sessions' if the service root does not contains the 'Links/Sessions' property for login
- Added Python version checks to use time.perf_counter() in favor of time.clock()

- Added IPv6 support to SSDP discovery
- Enhanced handling of poorly formatted URIs to not throw an exception

- Fixed usage of capath and cafile when setting them to None

- Added option in SSDP discovery to specify a particular interface
- Added sanitization to the Base URL to remove trailing slashes