PMM-14267 Fix persistence of changed listen ports

[ademidoff]

https://jira.percona.com/browse/PMM-14267

• PMM-14267 Fix persistence of changed listen ports percona/pmm#5007

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4217-43a54c7
Client docker: perconalab/pmm-client-fb:PR-4217-43a54c7
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4217-43a54c7
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4217-43a54c7.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4217-43a54c7&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4217-43a54c7.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/5134/

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4217-4188cc1
Client docker: perconalab/pmm-client-fb:PR-4217-4188cc1
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4217-4188cc1
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4217-4188cc1.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4217-4188cc1&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4217-4188cc1.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/5135/