Allow component upgrades to relocate own plugins

[1000TurquoisePogs]

Type of change

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• New feature (non-breaking change which adds functionality)

PR Checklist

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• If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• My code follows the style guidelines of this project (see: Contributing guideline)
• New and existing unit tests pass locally with my changes
• video or image is included if visual changes are made
• Relevant update to CHANGELOG.md
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works, or describe a test method below

VERSION: v2.12.0
CHANGELOG: enhancement: new versions of components can change the location of their plugins, as the app-server will now re-inspect the plugin locations on each startup.

Testing

To test this you can reorganize a component you have to change the location of a plugin within.
In the example below, i previously had the plugin at '.', and moved it to 'newlocation'.
I inspected that the code worked by reading the json at the bottom after a zowe restart, and it correctly had 'newlocation'.