utils/misc: Fix linters violation

A mix of pylint and PEP8 violations that GitHub action enforces.

wa/framework/instrument.py

@@ -98,7 +98,6 @@ def teardown(self, context):
 
 """
 
-import sys
 import logging
 import inspect
 from collections import OrderedDict

wa/utils/misc.py

@@ -289,7 +289,7 @@ def get_article(word):
               in all case; e.g. this will return ``"a hour"``.
 
     """
-    return'an' if word[0] in 'aoeiu' else 'a'
+    return 'an' if word[0] in 'aoeiu' else 'a'
 
 
 def get_random_string(length):

wa/utils/types.py

@@ -29,15 +29,14 @@
 import re
 import numbers
 import shlex
-import sys
 from bisect import insort
 from urllib.parse import quote, unquote  # pylint: disable=no-name-in-module, import-error
-from past.builtins import basestring  # pylint: disable=redefined-builtin
 # pylint: disable=wrong-import-position
 from collections import defaultdict
 from collections.abc import MutableMapping
 from functools import total_ordering
 
+from past.builtins import basestring  # pylint: disable=redefined-builtin
 from future.utils import with_metaclass
 
 from devlib.utils.types import identifier, boolean, integer, numeric, caseless_string