chore: complete google-auth-httplib2 migration (#16681)

- Reformat with nox
- Enable generation with librarian
- Regenerate with librarian

Author: jskeet

librarian.yaml

@@ -328,7 +328,6 @@ libraries:
       skip_readme_copy: true
   - name: google-auth-httplib2
     version: 0.3.1
-    skip_generate: true
     python:
       library_type: AUTH
       name_pretty_override: Google Auth httplib2

packages/google-auth-httplib2/.repo-metadata.json

@@ -1,13 +1,11 @@
 {
-    "name": "google-auth-httplib2",
-    "name_pretty": "Google Auth httplib2",
     "client_documentation": "https://googleapis.dev/python/google-auth-httplib2/latest",
+    "distribution_name": "google-auth-httplib2",
     "issue_tracker": "https://github.com/googleapis/google-cloud-python/issues",
-    "release_level": "preview",
     "language": "python",
     "library_type": "AUTH",
-    "repo": "googleapis/google-cloud-python",
-    "distribution_name": "google-auth-httplib2",
-    "default_version": "",
-    "codeowner_team": "@googleapis/googleapis-auth"
-}
+    "name": "google-auth-httplib2",
+    "name_pretty": "Google Auth httplib2",
+    "release_level": "preview",
+    "repo": "googleapis/google-cloud-python"
+}

packages/google-auth-httplib2/docs/conf.py

@@ -24,9 +24,9 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys
 import os
 import shlex
+import sys
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the

packages/google-auth-httplib2/google_auth_httplib2.py

@@ -19,11 +19,9 @@
 import http.client
 import logging
 
-from google.auth import exceptions
-from google.auth import transport
+from google.auth import exceptions, transport
 import httplib2
 
-
 _LOGGER = logging.getLogger(__name__)
 # Properties present in file-like streams / buffers.
 _STREAM_PROPERTIES = ("read", "seek", "tell")