management: delete deprecated methods in nfd::FaceStatus and nfd::FaceEventNotification

refs #1396

Change-Id: I9b76a3bb4fdeee035941a6cf0795746542e5759b
build: Warnings correction for gcc 4.2

Also in this commit some code style corrections.

Change-Id: Idf2b5b96b328fb3dbea7440362c84d7759a10ec5
Refs: #1429