Add UID and package name to TetheringRequest

Add a uid and package name to TetheringRequest to keep track of which
app the request belongs to, and also convey this information to Wifi
for later use with resource conflicts.

Bug: 216524590
Test: atest TetheringManagerTest TetheringServiceTest
Change-Id: If963694cb1bbd831ba379a76043825c94ef9d67a
8 files changed