Create TetheringPrivilegedTests which have MAINLINE_NETWORK_STACK
permission, the test can perform various network-related operations
which need CAP_NET_RAW and CAP_NET_ADMIN capabilities.
Bug: 145490751
Test: make TetheringPrivilegedTests
Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1345361
Merged-In: I3f1d7019f1a12647b78630a412df3adf03e9e95a
Change-Id: I93f8f6510e12a2a44bc576a4a801c0aac629df25