This change adds hierarchical call support for deleting Policy Tier1.
H-API is already enabled for Tier1 creation. The change has no impact
for callers not using H-API for delete.
Change-Id: Ib36a0faa125b2c12c206b7c6c9ebc3bd0e04330e
(cherry picked from commit 77688b9934fd61c7c1ada52da92252b12979bbee)