Bulk deletion, Adding owners to existing packages

Description:
1. Added support for adding owners to existing packages (basically copied code from Reserve command and made some changes)
2. Added ability to delete packages in bulk. The packages must be passed in as packages config file. 
3. Also added Quiet mode so that it can be used for bulk deletion. I am not defaulting to 'q' mode when bulk deleting packages, instead that must be passed in as a switch. 
4. Support for comma separated list of Ids hasn't been added for bulk delete since most use cases would be a package id, version pair for this scenario.