Refactor of consul modules (#7826)

* Extract common functionality.

* Refactor duplicated code into module_utils.

* Fixed ansible-test issues.

* Address review comments.

* Revert changes to consul_acl.

It uses deprecated APIs disabled since Consul 1.11 (which is EOL), don't
bother updating the module anymore.

* Remove unused code.

* Merge token into default doc fragment.

* JSON all the way down.

* extract validation tests into custom file and prep for requests removal.

* Removed dependency on requests.

* Initial test for consul_kv.

* fixup license headers.

* Revert changes to consul.py since it utilizes python-consul.

* Disable the lookup test for now.

* Fix python 2.7 support.

* Address review comments.

* Address review comments.

* Addec changelog fragment.

* Mark ConsulModule as private.

plugins/doc_fragments/consul.py

@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) Ansible project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
+class ModuleDocFragment:
+    # Common parameters for Consul modules
+    DOCUMENTATION = r"""
+options:
+  host:
+    description:
+      - Host of the consul agent, defaults to V(localhost).
+    default: localhost
+    type: str
+  port:
+    type: int
+    description:
+      - The port on which the consul agent is running.
+    default: 8500
+  scheme:
+    description:
+      - The protocol scheme on which the consul agent is running.
+        Defaults to V(http) and can be set to V(https) for secure connections.
+    default: http
+    type: str
+  validate_certs:
+    type: bool
+    description:
+      - Whether to verify the TLS certificate of the consul agent.
+    default: true
+  token:
+    description:
+      - The token to use for authorization.
+    type: str
+  ca_path:
+    description:
+      - The CA bundle to use for https connections
+    type: str
+"""