Rename mActiveTetheringRequests to mPendingTetheringRequests

mActiveTetheringRequests is a misnomer because the requests aren't
actually active yet. Rename this to mPendingTetheringRequests since
they're pending a link layer event that the iface is ready to start IP
serving.

Bug: 216524590
Test: covered by existing tests
Change-Id: Ib0c4a52e0aa72fc27b67bce25187124b20082c05
2 files changed