[Hoststubgen] Allow to apply policy based on inheritance

Use "*" + base class/interface name in the policy file to define
an inheritance based policy.

Wrote it to investigate classpath conflicting problem.

It's not actually used on ravenwood. (at least yet)

Test: ./ravenwood/run-ravenwood-tests.sh
Bug: 292141694
Change-Id: I173e2545a1ad9e0bc374d6798e1558dacc3569bd