Hub forcing to install tool that user don't need

[akranga]

Issue have happened by invoking backup verb. User selected a 'mysql' component that have the following statement:

requires:
  - kubernetes
  - helm

Then backup failed as the user have been prompted to install helm. This have led to frustration, as backup script doesn't contain any reference to helm. After user have installed a tool helm that he will never used, they were able to proceed with backup.

Expected bahavior: hub should not force tools that user doesn't need. There should be the way either: to setup alternative tools for verb via hub-component.yaml or bypass tools check via CLI argument