* Move the @current_workspace tracking to workspace proxy
* Create helper for handling workspace value in opts
* Call framework.db.proxy across dbmanager files now that active ws is tracked in proxy
NOTE: This commit throws an exception when adding a remote data service.
This method was in Msf::DbManager class but doesn't actually use the DB.
This required you to have a DB connection just to do the check.
Moved it out to a helper library so we have access to it without forcing
a DB connection.
James Barnett