python: Support quick subkey creation.
* NEWS: Update. * lang/python/gpg/core.py (Context.create_subkey): New function. * lang/python/tests/Makefile.am (XTESTS): Add new test. * lang/python/tests/t-quick-subkey-creation.py: New file.
- Signed-off-by: Justus Winter <justus@g10code.com>