Revert "Refactor RouterAdvertisementDaemon to build new RA in HandlerThread"

This reverts commit 23a2158c386679d60ffe00a1d457a0a252547052.

Reason for revert: Design changes, don't use extra Handler in RouterAdvertisementDaemon.

Change-Id: Iba829ec028e887b6625f4f972e936ca5757a7614
1 file changed