Fix Picocli warnings and startup and native execution

[michalvavrik]

Summary

So far when we run Picocli apps we have experienced:

• we need to call BaseService::start async because the app never gets ready
• there are strange warnings WARNING Exception reading file log file because log file doesn't exist
• native execution fails in some cases (like in the QE TS, see daily builds)

This PR fixes that. I have tested it with changes that I pushed into this PR quarkus-qe/quarkus-test-suite#2043.

Please check the relevant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Dependency update
• Refactoring
• Release (follows conventions described in the RELEASE.md)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• This change requires execution against OCP (use run tests phrase in comment)

Checklist:

• Example scenarios has been updated / added
• Methods and classes used in PR scenarios are meaningful
• Commits are well encapsulated and follow the best practices

[jcarranzan]

It looks good to me for our CLI testing apps.