Allow adding a script app aware instance by tags

Allow adding a script app aware instance by tags

Previously there was just one option to enable ‘app aware’ backups, and that is by using the ‘app-aware’ keyword (you can find more details in User Guide - section 13.2.3).  Now we added two more:

    ‘app-aware’ (old one) - enables the ‘app aware’ feature, and VSS on agent (by default). Backup scripts are disabled.
    ‘app-aware-vss’ (new) - enables the ‘app aware’ feature, and VSS on agent (explicitly). Backup scripts are disabled.
    ‘app-aware-script’ (new) - enables the ‘app aware’ feature, and backup scripts on agent. VSS is disabled.

Please note that this addition is relevant only for Windows instances.

Reference defect number - 8df908f99c