upload: remove nossl option

Rest APIs doesn't support plain http connection
so nossl doesn't make sense. Removing it.

Change-Id: I04934a3a2c7b004c94692d5b163a73746c29d38c
Bug-Url: https://bugzilla.redhat.com/1100825
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>