Switch to py-consul (#3191)

python-consul is unmaintained for a long time and py-consul is an official replacement.
However, we still keep backward compatibility with python-consul.

Close: #3189

setup.py

@@ -25,7 +25,7 @@ KEYWORDS = 'etcd governor patroni postgresql postgres ha haproxy confd' +\
     ' zookeeper exhibitor consul streaming replication kubernetes k8s'
 
 EXTRAS_REQUIRE = {'aws': ['boto3'], 'etcd': ['python-etcd'], 'etcd3': ['python-etcd'],
-                  'consul': ['python-consul'], 'exhibitor': ['kazoo'], 'zookeeper': ['kazoo'],
+                  'consul': ['py-consul'], 'exhibitor': ['kazoo'], 'zookeeper': ['kazoo'],
                   'kubernetes': [], 'raft': ['pysyncobj', 'cryptography'], 'jsonlogger': ['python-json-logger']}
 
 # Add here all kinds of additional classifiers as defined under