Update to new soledad package scheme.
Improve test coverage for ProviderBootstrapper.
Improve test coverage for VPNGatewaySelector.
Improve test coverage for StreamToLogger.
Re-add parentdir prefix

Now matching the next python package name in pypi.
Merge remote-tracking branch 'kali/bug/fix-versioneer-parentdir' into develop
Merge remote-tracking branch 'ivan/feature/improve-coverage' into develop
Merge remote-tracking branch 'chiiph/feature/mail_ui' into develop
Merge branch 'develop' of ssh://leap.se/leap_client into develop
pep8
Merge remote-tracking branch 'drebs/feature/3487-split-soledad-into-common-client-and-server' into develop
Merge remote-tracking branch 'kali/bug/pep8' into develop
Use DELETE /1/logout to properly logout