Remove unneeded gce from upload_utils

This is gce specific and already existing in the gce specific part and
can be just removed.

Change-Id: I8838e3587cf5a2044bd4945f5ecea3f3290deddc

roles/upload-logs-base/module_utils/zuul_jobs/upload_utils.py

@@ -24,10 +24,8 @@ __metaclass__ = type
 Generic utilities used for log upload.
 """
 
-import datetime
 import gzip
 import io
-import json
 import logging
 import mimetypes
 import os
@@ -42,8 +40,6 @@ except ImportError:
 import zlib
 import collections
 
-import google.auth.compute_engine.credentials as gce_cred
-
 
 try:
     # Python 3.3+
@@ -249,20 +245,6 @@ def sizeof_fmt(num, suffix='B'):
     return "%.1f%s%s" % (num, 'Y', suffix)
 
 
-class Credentials(gce_cred.Credentials):
-    def __init__(self, path):
-        super(Credentials, self).__init__()
-        self._path = path
-        self.refresh(None)
-
-    def refresh(self, request):
-        with open(self._path) as f:
-            data = json.loads(f.read())
-        self.token = data['access_token']
-        self.expiry = (datetime.datetime.utcnow() +
-                       datetime.timedelta(seconds=data['expires_in']))
-
-
 class FileDetail():
     """
     Used to generate indexes with links or as the file path