Improvements on 'list packages' command:

- Removed redundant -lf (which behaves like -f).
- Added missing options to help.
- Added a --uid UID option to filter packages by UID.
- Added a -U option to display the package UID.

Change-Id: Ia55520377771c1aecd98cb8ccce04d9530ad951a
Fixes: 29872396