Removed silly debug statements
Nicknym support for get_key and refresh_keys
NOTE: A lot of checking is missing here. Much of the checking is missing
      due to the lack of detail in the specification. I have opened issues
      on the LEAP project issue tracker in the hopes of remedying this:
      * https://leap.se/code/issues/5340
      * https://leap.se/code/issues/5341
      * https://leap.se/code/issues/5342