Charm fails on xenial, missing /etc/corosync/uidgid.d/ dir

Deploying the charm on xenial fails with:

root@juju-trusty-machine-32:/var/lib/juju/agents/unit-dashboard-hacluster-0/charm# ./hooks/config-changed
Traceback (most recent call last):
  File "./hooks/config-changed", line 412, in <module>
    hooks.execute(sys.argv)
  File "/var/lib/juju/agents/unit-dashboard-hacluster-0/charm/hooks/charmhelpers/core/hookenv.py", line 717, in execute
    self._hooks[hook_name]()
  File "./hooks/config-changed", line 140, in config_changed
    if configure_corosync():
  File "/var/lib/juju/agents/unit-dashboard-hacluster-0/charm/hooks/utils.py", line 487, in wrapped_f
    return_data = f(*args, **kwargs)
  File "/var/lib/juju/agents/unit-dashboard-hacluster-0/charm/hooks/utils.py", line 505, in configure_corosync
    return emit_base_conf() and emit_corosync_conf()
  File "/var/lib/juju/agents/unit-dashboard-hacluster-0/charm/hooks/utils.py", line 267, in emit_base_conf
    content=render_template('hacluster.acl', {}))
  File "/var/lib/juju/agents/unit-dashboard-hacluster-0/charm/hooks/charmhelpers/core/host.py", line 299, in write_file
    with open(path, 'wb') as target:
IOError: [Errno 2] No such file or directory: '/etc/corosync/uidgid.d/hacluster'