Comment 2 for bug 1908282

Similar issue seen on nova-cloud-controller:

https://review.opendev.org/c/openstack/charm-nova-cloud-controller/+/770415
https://zuul.opendev.org/t/openstack/build/d3ba0987f75c455285a645059f1ea8bf

    Traceback (most recent call last):

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/.tox/py36/lib/python3.6/site-packages/mock/mock.py", line 1346, in patched
    return func(*newargs, **newkeywargs)

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/unit_tests/test_nova_cc_hooks.py", line 465, in test_update_ssh_keys_and_notify_compute_units_ssh_migration
    hooks.update_ssh_keys_and_notify_compute_units()

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/hooks/nova_cc_hooks.py", line 740, in update_ssh_keys_and_notify_compute_units
    update_ssh_key(rid=rid, unit=unit)

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/hooks/nova_cc_hooks.py", line 853, in update_ssh_key
    resolved_hosts = ncc_utils.resolve_hosts_for(private_address, hostname)

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/hooks/nova_cc_utils.py", line 1337, in resolve_hosts_for
    db = unitdata.kv()

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/charmhelpers/core/unitdata.py", line 524, in kv
    _KV = Storage()

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/charmhelpers/core/unitdata.py", line 189, in __init__
    self._init()

      File "/home/zuul/src/opendev.org/openstack/charm-nova-cloud-controller/charmhelpers/core/unitdata.py", line 389, in _init
    )''')

    sqlite3.OperationalError: database is locked