shill: Remove PriorityWithinTechnology property

The PriorityWithinTechnology property is unused and also obsolete due to
the recent changes in CL:1136437.

CQ-DEPEND=CL:1136437
BUG=chromium:848719
TEST=none

Change-Id: I3f439fd3dd0a1f0fc4e0bd4c27b4d911ff578101
Reviewed-on: https://chromium-review.googlesource.com/1150233
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
1 file changed