PMM-7 migrated PMM container components tests to unittest

[vyarosh]

Currently will fail until percona/pmm#2489 will be merged.

could be tested on PMM-12223 FB ex: perconalab/pmm-server-fb:PR-3393-e534bc6
the usage is the same, but unittest output is more informative and all tests are executed:

dd@vbox1:/media/sf_work/PMM/pmm-qa/pmm-tests$ python3 check_uprade.py -v 2.40.0
test_alert_manager_status (__main__.PmmServerComponents) ... ok
test_clickhouse_status (__main__.PmmServerComponents) ... ok
test_clickhouse_version (__main__.PmmServerComponents)
PMM-12223 - Verify Clickhouse is v23.8 or later since 2.41.0 ... skipped 'Since version 2.41.0'
test_dbaas_controller_version (__main__.PmmServerComponents) ... ok
test_grafana_status (__main__.PmmServerComponents) ... ok
test_nginx_status (__main__.PmmServerComponents) ... ok
test_percona_dashboards_version (__main__.PmmServerComponents) ... ok
test_percona_qan_api2_version (__main__.PmmServerComponents) ... ok
test_pmm2_client_version (__main__.PmmServerComponents) ... ok
test_pmm_agent_status (__main__.PmmServerComponents) ... ok
test_pmm_dump_version (__main__.PmmServerComponents) ... ok
test_pmm_managed_status (__main__.PmmServerComponents) ... ok
test_pmm_managed_version (__main__.PmmServerComponents) ... ok
test_pmm_update_version (__main__.PmmServerComponents) ... skipped 'for 2.25.0 only!'
test_postgresql_status (__main__.PmmServerComponents) ... ok
test_qan_api2_status (__main__.PmmServerComponents) ... ok
test_vertamedia_clickhouse_plugin_absent (__main__.PmmServerComponents) ... ok
test_victoria_metrics_alert_status (__main__.PmmServerComponents) ... ok
test_victoria_metrics_version (__main__.PmmServerComponents) ... ok
test_victoriametrics_status (__main__.PmmServerComponents) ... ok

----------------------------------------------------------------------
Ran 20 tests in 3.824s

OK (skipped=2)

[vyarosh]

Passing logs: https://pmm.cd.percona.com/blue/organizations/jenkins/pmm2-upgrade-tests/detail/pmm2-upgrade-tests/33354/pipeline/110
Failure logs: https://pmm.cd.percona.com/blue/organizations/jenkins/pmm2-upgrade-tests/detail/pmm2-upgrade-tests/33382/pipeline/ (expected version set to 2.42.0 to fail the job)

[yurkovychv]

looks good
could you also run ami and ovf upgrades?

[vyarosh]

AMI: https://pmm.cd.percona.com/blue/organizations/jenkins/pmm2-ami-upgrade-tests/detail/pmm2-ami-upgrade-tests/1813/pipeline/58

[saikumar-vs]

Very nice improvements, thanks for working on this.

[vyarosh]

OVF: https://pmm.cd.percona.com/blue/organizations/jenkins/pmm2-ovf-upgrade-tests/detail/pmm2-ovf-upgrade-tests/1394/pipeline/67

This change is not required at this time