Remove test_plugins directory

Now that the `greaterthan` test exists in upstream Jinja, we can
remove this plugin from the role.

Change-Id: I8a0624fee701892e069a741c3c486c795e0f3a7c

test_plugins/custom_tests.py

@@ -1,39 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2016, Rackspace US, Inc.
-#
-# 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.
-"""Extra tests for jinja2 templates in Ansible."""
-
-# NOTE(mhayden): Remove this file when jinja 2.9.5 is available for use within
-# OpenStack.
-
-
-def greaterthan(value, reference_value):
-    """Return true if value > reference_value."""
-    return value > reference_value
-
-
-def lessthan(value, reference_value):
-    """Return true if value < reference_value."""
-    return value < reference_value
-
-
-class TestModule:
-    """Main test class from Ansible."""
-
-    def tests(self):
-        """Add these tests to the list of tests available to Ansible."""
-        return {
-            'greaterthan': greaterthan,
-            'lessthan': lessthan,
-        }