This commit also refactors FaceMonitor as generic NotificationSubscriber,
and refactors AutoregServer to use FaceMonitor.
refs #1837#1838
Change-Id: I8b40dfae118853d1224c8290cf92e7cc0daa116f
This change ensures interface uniformity between nfd::AppFace and
ndn::Face and allow now templated version of SegmentPublisher to be used
with either.
Change-Id: I82e29528b13b37bd2ae27ef47db30e8c87c15a38
Refs: #1749