Remove email instructions/reference. Closes #6140.

- cleanup some code,
- remove unused import,
- pep8 fixes
Add support for the internal LXDE polkit agent.

Closes #6043.
Fix compatibilty with newest openssl. Closes: #6133

Newest OpenSSL expect cafile to be None or byte stream (was retunrning
unicode)
Do not use logger.exception during provider checks.

Closes: #6219

leap log handler was choking on the captured exception.
it might have to do with the exception unwinding made by the reactor.
this is a workaround to allow the provider checks to show a meaningful
error message. The backtrace should only be there for development
purpuses, so removing it.
vpn: support for the server setting custom fragment openvpn option
Fold in changes and update relnotes.
Merge tag '0.7.0rc5' into debian/experimental

Tag leap.bitmask version 0.7.0rc5
bump debian changelog
freeze debian version (0.7.0rc5)