[doc] update requirements for all consul modules/lookups (#10863)

* [doc] update requirements for consul_kv module

python-consul has been unmaintained for a while. It uses a legacy way of passing the Consul token when sending requests. This leads to warning messages in Consul log, and will eventually break communication. Using the maintained py-consul library ensures compatibility to newer Consul versions.

* [doc] replace all python-consul occurrences with py-consul

* [fix] tests and possible pip server errors

* [chore] remove referencce to python-consul in comment

---------

Co-authored-by: Sebastian Damm <sebastian.damm@pascom.net>

plugins/modules/consul_kv.py

@@ -20,7 +20,7 @@ description:
     of the results.
   - See http://www.consul.io/docs/agent/http.html#kv for more details.
 requirements:
-  - python-consul
+  - py-consul
   - requests
 author:
   - Steve Gargan (@sgargan)
@@ -150,8 +150,8 @@ except ImportError:
 
 from ansible.module_utils.basic import AnsibleModule
 
-# Note: although the python-consul documentation implies that using a key with a value of `None` with `put` has a
-# special meaning (https://python-consul.readthedocs.io/en/latest/#consul-kv), if not set in the subsequently API call,
+# Note: although the py-consul implementation implies that using a key with a value of `None` with `put` has a special
+# meaning (https://github.com/criteo/py-consul/blob/master/consul/api/kv.py), if not set in the subsequently API call,
 # the value just defaults to an empty string (https://www.consul.io/api/kv.html#create-update-key)
 NOT_SET = None