mysql-router upgrade reliability

[jneo8]

Current upgrade plan for myql-router:

Upgrade plan for 'keystone-mysql-router' to 'victoria'
    Refresh 'keystone-mysql-router' to the latest revision of '8.0/stable'
    Wait for up to 300s for app 'keystone-mysql-router' to reach the idle state

The case is the charm failed during the refresh to 8.0/stable, and the package still the old version on the unit due to some environment issue.

In this case

• COU wouldn't check the package version on the unit
• If user re run COU, COU will consider it's finished because the channel is already the target version.
• Also the configuration source is the still the old one, need to verify why COU doesn't include source configuration change step. $ juju config keystone-mysql-router source

Suggest solution:

Add package version check and the possible operation to fix it.

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/SOLENG-805.

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