Python-bugzilla

- Bugzilla REST API support
- Add --json command line output option
- Add APIs for Bugzilla Groups (Pierre-Yves Chibon)
- Add `Bugzilla.get_requests_session()` API to access raw requests Session
- Add `Bugzilla.get_xmlrpc_proxy()` API to access raw ServerProxy
- Add `Bugzilla requests_session=` init parameter to pass in auth, etc.
- Add `bugzilla attach --ignore-obsolete` (Čestmír Kalina)
- Add `bugzilla login --api-key` for API key prompting (Danilo C. L. de
Paula)
- Add `bugzilla new --private`

- restrict-login suppot (Viliam Krizan)
- cli: Add support for private attachments (Brian 'Redbeard' Harrington)
- Fix python3 deprecation warnings
- Drop python 3.3 support, minimum python3 is python 3.4 now

- Port tests to pytest
- cli: --cert Client side certificate support (Tobias Wolter)
- cli: add ability to post comment while sending attachment (Jeff Mahoney)
- cli: Add --comment-tag option
- cli: Add info --active-components
- Add a raw Product.get wrapper API

- Support for bugzilla 5 API Keys (Dustin J. Mitchell)
- bugzillarc can be used to set default URL for the cli tool
- Revive update_flags wrapper
- Bug fixes and minor improvements

This release contains several small to medium API breaks. I expect most users
won't notice any difference. I previously outlined the changes here:

https://lists.fedorahosted.org/archives/list/python-bugzillalists.fedorahosted.org/thread/WCYPOKJZFYOW7RRT44FCM5GQU26O56K4/

The major changes are:

- Several fixes for use with bugzilla 5
- Bugzilla.bug_autorefresh now defaults to False
- Credentials are now cached in ~/.cache/python-bugzilla/
- bin/bugzilla was converted to argparse
- bugzilla query --boolean_chart option is removed
- Unify command line flags across sub commands

- Switch hosting to http://github.com/python-bugzilla/python-bugzilla
- Fix requests usage when ndg-httpsclient is installed (Arun Babu
Neelicattu)
- Add non-rhbz support for getting bug comments (AJ Lewis)
- Misc bugfixes and improvements