Fix for redundant printing of CLI help options

[Rana-KV]

Removing redundant CLI print line to fix the double print of keystore option when "taf dependencies add --help" is used.

Description

Fixes #428
Issue: "taf dependencies add --help" lists "--keystore" twice
Changes to address the Issue: Removed redundant print lines in "taf dependencies add --help".

Code review checklist (for code reviewer to complete)

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Commit messages are meaningful (see this for details)
• Tests have been included and/or updated, as appropriate
• Docstrings have been included and/or updated, as appropriate
• Changelog has been updated, as needed (see CHANGELOG.md)