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.
(cherry picked from commit 44679e71a2)
Co-authored-by: Florian Apolloner <florian@apolloner.eu>
