Remove --upload option

The --upload option has a lot of limitations and has not been
widely used. Recent trends are to handle uploading data in
higher-level tools (e.g. redhat-support-tool or web based
management UIs) and the python ftp library does not support
modern requirements like HTTP proxy traversal or encryption.

Fixes Issue #217

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>