Some roles made a bad usage of the 'node_config_directory' variable.

As described here:
https://github.com/openstack/kolla-ansible/blob/master/ansible/group_vars/all.yml#L16

'node_config_directory' is the directory to store the config files on
the destination node.

This variable MUST be changed to 'node_custom_config'.
Futhermore this will unified all roles.

Closes-Bug: #1682445
Change-Id: Id8d8a1268c79befac8938c1e0396267314b40301