Let convertKeyIdToHex handle short key IDs

If a short key ID is given, then it should only be displayed as such.
Add debug logging for hkp keyserver actions
Merge pull request #455 from thi/454-fix-convert-key-id-to-hey-to-handle-short-key-ids

454 fix convert key id to hey to handle short key ids
Dont try to parse key/fingerprint result from keyserver query
Use getter and setter
colorize fingerprint in import
put colorize method into key helper