Remove unused imports and fix a small lint issue

libagent/age/__init__.py

@@ -9,21 +9,17 @@ See these links for more details:
 
 import argparse
 import base64
-import contextlib
-import datetime
 import io
 import logging
 import os
 import sys
-import traceback
 
 import bech32
 import pkg_resources
-import semver
 from cryptography.exceptions import InvalidTag
 from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305
 
-from .. import device, server, util
+from .. import device, util
 from . import client
 
 log = logging.getLogger(__name__)

libagent/device/onlykey.py

@@ -159,7 +159,7 @@ class OnlyKey(interface.Device):
                 else:
                     vk = ecdsa.VerifyingKey.from_string(ok_pubkey, curve=ecdsa.SECP256k1)
                 return vk
-        else:
+
         ok_pubkey = []
         while time.time() < t_end:
             try:

libagent/signify/__init__.py

@@ -2,21 +2,12 @@
 
 import argparse
 import binascii
-import contextlib
-import functools
 import hashlib
 import logging
-import os
-import re
-import struct
-import subprocess
 import sys
 import time
 
-import pkg_resources
-import semver
-
-from .. import formats, server, util
+from .. import util
 from ..device import interface, ui
 
 log = logging.getLogger(__name__)