ntp hook failed: "ntp-peers-relation-joined" due to disk I/O error

[Bas de Bruijne]

In testrun https://solutions.qa.canonical.com/testruns/testRun/91488cb4-ade6-4955-a3f0-b3189ba807dd, ntp goes into an error state when setting up lma on AWS:

```
elasticsearch/2* active idle 3 18.212.129.89 9200/tcp Ready
  canonical-livepatch/2 active idle 18.212.129.89 Running kernel 5.15.0-1017.21~20.04.1-aws, patchState: nothing-to-apply (source version/commit dad6199)
  filebeat/2 active idle 18.212.129.89 Filebeat ready.
  ntp/2 error idle 18.212.129.89 123/udp hook failed: "ntp-peers-relation-joined"
  telegraf/2 active idle 18.212.129.89 9103/tcp Monitoring elasticsearch/2
```

In the logs we see an error:
```
unit-ntp-2: 09:12:03 INFO unit.ntp/2.juju-log ntp-peers:2: Invoking reactive handler: hooks/relations/juju-info/requires.py:19:changed:juju-info
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined Traceback (most recent call last):
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined File "/var/lib/juju/agents/unit-ntp-2/charm/hooks/ntp-peers-relation-joined", line 22, in <module>
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined main()
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined File "/var/lib/juju/agents/unit-ntp-2/.venv/lib/python3.8/site-packages/charms/reactive/__init__.py", line 84, in main
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined hookenv._run_atexit()
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined File "/var/lib/juju/agents/unit-ntp-2/.venv/lib/python3.8/site-packages/charmhelpers/core/hookenv.py", line 1357, in _run_atexit
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined callback(*args, **kwargs)
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined File "/var/lib/juju/agents/unit-ntp-2/charm/lib/charms/layer/basic.py", line 513, in clear_config_states
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined unitdata.kv().flush()
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined File "/var/lib/juju/agents/unit-ntp-2/.venv/lib/python3.8/site-packages/charmhelpers/core/unitdata.py", line 377, in flush
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined self.conn.commit()
unit-ntp-2: 09:12:03 WARNING unit.ntp/2.ntp-peers-relation-joined sqlite3.OperationalError: disk I/O error
```

Link to crashdumps:
https://oil-jenkins.canonical.com/artifacts/91488cb4-ade6-4955-a3f0-b3189ba807dd/index.html

[Bas de Bruijne (basdbruijne)]

Marking as invalid due to inactivity