python: Add accessors for the protocol.
python: Add accessors for the protocol.

* lang/python/pyme/core.py (Context.__init__): Add 'protocol'
parameter.
(Context.protocol): New accessors.

Signed-off-by: Justus Winter <4d1bd7a5ca1cd26bee0df05b6801a6ce9a22196e@g10code.com>

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme