Make Artisan to not require database connection when not needed, other improvements

Summary:

• remove requirement on DB connection to get object properties available for update
• make all scalpel commands hidden (a few of them were not hidden)
• removed some redundant code

Test Plan: ./phpunit

Reviewers: #hkccp_developers, mollekopf

Reviewed By: #hkccp_developers, mollekopf

Subscribers: #hkccp_developers

Differential Revision: https://git.kolab.org/D4388