git-cl: Fix retrieving gitcookies path.

Decode the result of reading http.cookiefile from git config

Bug: 1066992
Change-Id: I1d4f2c8e54f717ef61ab4e630f3f66206c56047e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2132774
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

gerrit_util.py

@@ -203,8 +203,9 @@ class CookiesAuthenticator(Authenticator):
     if os.getenv('GIT_COOKIES_PATH'):
       return os.getenv('GIT_COOKIES_PATH')
     try:
-      return subprocess2.check_output(
-          ['git', 'config', '--path', 'http.cookiefile']).strip()
+      path = subprocess2.check_output(
+          ['git', 'config', '--path', 'http.cookiefile'])
+      return path.decode('utf-8', 'ignore').strip()
     except subprocess2.CalledProcessError:
       return os.path.expanduser(os.path.join('~', '.gitcookies'))
 

tests/gerrit_util_test.py

@@ -126,7 +126,7 @@ class CookiesAuthenticatorTest(unittest.TestCase):
         os.path.expanduser(os.path.join('~', '.gitcookies')),
         gerrit_util.CookiesAuthenticator().get_gitcookies_path())
 
-    subprocess2.check_output.side_effect = ['http.cookiefile']
+    subprocess2.check_output.side_effect = [b'http.cookiefile']
     self.assertEqual(
         'http.cookiefile',
         gerrit_util.CookiesAuthenticator().get_gitcookies_path())