gkeys: Move all GKEYS definitions to it's own file

Fix imports in other files.
gkeys/gkey.py: Add keys and uid fields, update() to GKEY

keys field will hold the primary key fingerprints for the (to be/) installed GKEY.
fingerprints and uid fileds will be populated with all uid's and fingerprints defined in subkeys using the update().
gkeys: Add keys and uid options to actions and seed handling

Add code to auto-update existing installed gkey.seeds files with the additional data.
gkeys/lib.py: Add the new GKEY.update() to add_key and refresh_key

This updates our installed gkey.seed with all fingerprints including sub-keys and uid's.  This way searches for keys used to sign files can be found if the key used to sign the file was not a primary key.
gkeys/actions.py: Add auto-search capability to verify

If verification fails with NO_PUBKEY, it then does a search for the correct verification keyring to verify with.