Use the client version in the connection

rather then setting it to the TARGET_JUJU_VERSION

Author: cderici

juju/client/connection.py

@@ -17,7 +17,7 @@
 from juju import errors, tag, utils, jasyncio
 from juju.client import client
 from juju.utils import IdQueue
-from juju.version import TARGET_JUJU_VERSION
+from juju.version import CLIENT_VERSION
 
 log = logging.getLogger('juju.client.connection')
 
@@ -963,7 +963,7 @@ def _build_facades(self, facades_from_connection):
     async def login(self):
         params = {}
         # Set the client version
-        params['client-version'] = TARGET_JUJU_VERSION
+        params['client-version'] = CLIENT_VERSION
         params['auth-tag'] = self.usertag
         if self.password:
             params['credentials'] = self.password