Deployment on trusty fails

[Liam Young]

Charm fails to deploy on trusty as it tries to write the pacemaker authkey to a directory which does not exist yet resulting in:

2019-04-04 09:39:21 DEBUG config-changed Traceback (most recent call last):
2019-04-04 09:39:21 DEBUG config-changed File "/var/lib/juju/agents/unit-hacluster-6/charm/hooks/config-changed", line 585, in <module>
2019-04-04 09:39:21 DEBUG config-changed hooks.execute(sys.argv)
2019-04-04 09:39:21 DEBUG config-changed File "/var/lib/juju/agents/unit-hacluster-6/charm/charmhelpers/core/hookenv.py", line 909, in execute
2019-04-04 09:39:21 DEBUG config-changed self._hooks[hook_name]()
2019-04-04 09:39:21 DEBUG config-changed File "/var/lib/juju/agents/unit-hacluster-6/charm/hooks/config-changed", line 187, in config_changed
2019-04-04 09:39:21 DEBUG config-changed if configure_corosync():
2019-04-04 09:39:21 DEBUG config-changed File "/var/lib/juju/agents/unit-hacluster-6/charm/hooks/utils.py", line 857, in wrapped_f
2019-04-04 09:39:21 DEBUG config-changed return_data = f(*args, **kwargs)
2019-04-04 09:39:21 DEBUG config-changed File "/var/lib/juju/agents/unit-hacluster-6/charm/hooks/utils.py", line 892, in configure_corosync
2019-04-04 09:39:21 DEBUG config-changed return emit_base_conf() and emit_corosync_conf()
2019-04-04 09:39:21 DEBUG config-changed File "/var/lib/juju/agents/unit-hacluster-6/charm/hooks/utils.py", line 362, in emit_base_conf
2019-04-04 09:39:21 DEBUG config-changed perms=0o440)
2019-04-04 09:39:21 DEBUG config-changed File "/var/lib/juju/agents/unit-hacluster-6/charm/charmhelpers/core/host.py", line 555, in write_file
2019-04-04 09:39:21 DEBUG config-changed with open(path, 'wb') as target:
2019-04-04 09:39:21 DEBUG config-changed FileNotFoundError: [Errno 2] No such file or directory: '/etc/pacemaker/authkey'

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/649649
Committed: https://git.openstack.org/cgit/openstack/charm-hacluster/commit/?id=ed3ea84126991f3c9a513d1fb4cdb2b6fa939ce8
Submitter: Zuul
Branch: master

commit ed3ea84126991f3c9a513d1fb4cdb2b6fa939ce8
Author: Liam Young <email address hidden>
Date: Wed Apr 3 15:43:01 2019 +0000

    Install libmaas for stonith plugin

    The libmaas stonith plugin uses libmaas which is supplied via
    python3-libmaas. python3-libmaas is available from bionic onwards
    so install it where possible.

    Also, drive by fix to precreate /etc/pacemaker dir if needed to fix
    trusty installs.

    Closes-Bug: #1823300
    Closes-Bug: #1823302

    Change-Id: Ib14146f7f667f9c52e11d222f950efcb7cb47a7f