disable ssh session sharing for stackhpc

Author: sjpb

environments/.stackhpc/ansible.cfg

@@ -11,5 +11,6 @@ roles_path = ../../ansible/roles
 filter_plugins = ../../ansible/filter_plugins
 
 [ssh_connection]
-ssh_args = -o ControlMaster=auto -o ControlPersist=240s -o PreferredAuthentications=publickey -o UserKnownHostsFile=/dev/null
+#ssh_args = -o ControlMaster=auto -o ControlPersist=240s -o PreferredAuthentications=publickey -o UserKnownHostsFile=/dev/null
+ssh_args = -o PreferredAuthentications=publickey -o UserKnownHostsFile=/dev/null
 pipelining = True