Do not attempt to fetch private keys from server.
Adapt keymanager tests for latest Soledad api.
use temporary openpgpwrapper as a context manager

in this way we implicitely catch any exception during
the wrapped call, and ensure that the destructor is always
called.
Adapt get_key() and send_key() to the spec.

* Use session_id instead of token for now.
* Receive info needed to interact with webapp API as params and
  setters/getters.
* Use the webapp API for sending the key to server.
* Prevent from refreshing own key.
Remove openpgp symmetric encryption.
make more compact debug info by truncating strings
Merge remote-tracking branch 'kali/bug/more-compact-debug' into develop
Properly use AES in CTR mode