New keymanager API

   get_all_keys_in_local_db -> get_all_keys
   parse_openpgp_ascii_key -> None
Handle removals on the updater repo
Update i18n strings.

Exclude pinned providers and tests from the bitmask.pro generator since
there is no strings to translate in there.
Merge branch 'ivan/feature/update-i18n-strings' into develop
Replace triple dot character with 3 dots.

The string was unicode and the conversion was troublesome, was displayed
badly on transifex.
Merge branch 'ivan/bug/fix-broken-str' into develop
Merge remote-tracking branch 'meskio/feature/keymanager_api' into develop
Merge remote-tracking branch 'meskio/bug/6146_release_handle_removals' into develop
Add new leap.keymanager version to VERSION_COMPAT
Merge remote-tracking branch 'meskio/feature/keymanager_api' into develop
Fix typos on strings and remove unused button.

This was reported by the user 'strel' on transifex.
Merge branch 'ivan/bug/fix-strings' into develop
Set version to 0.7.0 and date to the rc1 date.
Better error message for PostLimitError.

Suggested by user 'kingu' on transifex.
Remove unused scripts
Remove unused TUF helpers.

These files are now in the bitmask_bundler repo.
Remove email instructions/reference. Closes #6140.

- cleanup some code,
- remove unused import,
- pep8 fixes