Upgrade python/apitools to v0.5.31

Exempt-From-Owner-Approval:
Change-Id: I87e804ff19a93d51d6244f834bceebc32536801e
diff --git a/METADATA b/METADATA
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+++ b/METADATA
@@ -0,0 +1,19 @@
+name: "apitools"
+description: "google-apitools is a collection of utilities to make it easier to build client-side tools, especially those that talk to Google APIs."
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://github.com/google/apitools"
+  }
+  url {
+    type: GIT
+    value: "https://github.com/google/apitools"
+  }
+  version: "v0.5.31"
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2020
+    month: 5
+    day: 14
+  }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
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+++ b/MODULE_LICENSE_APACHE2
diff --git a/OWNERS b/OWNERS
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+++ b/OWNERS
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+# Default owners are top 3 or more active developers of the past 1 or 2 years
+# or people with more than 10 commits last year.
+# Please update this list if you find better owner candidates.
[email protected]
diff --git a/TEST_MAPPING b/TEST_MAPPING
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+++ b/TEST_MAPPING
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+{
+  "presubmit" : [
+    {
+      "name" : "acloud_test",
+      "host" : true
+    }
+  ]
+}
diff --git a/apitools/Android.bp b/apitools/Android.bp
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+++ b/apitools/Android.bp
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+// Copyright 2018 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+python_library {
+    name: "py-apitools",
+    host_supported: true,
+    srcs: [
+        "*.py",
+        "base/*.py",
+        "base/py/*.py",
+        "gen/*.py",
+        "scripts/*.py",
+    ],
+    version: {
+        py2: {
+            enabled: true,
+        },
+        py3: {
+            enabled: true,
+        },
+    },
+    libs: [
+        "py-httplib2",
+        "py-oauth2client",
+        "py-six",
+    ],
+    pkg_path: "apitools",
+}
+