Allow to use yaml config for install-app script

[lchudinov]

Proposed changes

This PR allows to specify zowe.yaml config as an argument for install-app script.

This PR depends upon the following PRs:

Type of change

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

PR Checklist

Please delete options that are not relevant.

• 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)
• I have commented my code, particularly in hard-to-understand areas

Testing

Further comments