Revert "[NS D05] Rework how to tear down networks"

Revert submission 10343065

Reason for revert: This is part of a feature that was punted out of R.
Reverted Changes:
Ic9a3d3363:[NS D05] Rework how to tear down networks
I7d815f873:[NS D06] Implement more policies
I561098476:[NS D07] Use the unmodified legacy score

Change-Id: I8d2696d15999265d79abfc9163e7e5ccad873cfe
3 files changed