Revert new tests and PackageManager mock

A mocked PackageManager caused test failures in existing tests.
Revert that for now to make tests pass again.

Bug: 114231106
Bug: 130397860
Test: atest FrameworksNetTests

Merged-In: Ib59e211d4329f885108de9ea0a74669ffb144e17
(cherry picked from commit 8574c9bf)

Change-Id: I603a0b0dfb67a942679a668c182aa650774c80b2