This commit also changes how version number is handled. Version is now
fully controlled from top-level wscript. In addition to that, a new
NFD_VERSION_BUILD_STRING macro is set to include more detailed
information, including commit ID (e.g., "0.1.0-rc1-1-g5c86570").
Change-Id: I448eb627e0c42dc814de1107cf7bb0dc94fa2a89
Refs: #1575
`nfd-start` starts NFD and RIB daemon.
`nfd-stop` stops NFD and RIB daemon.
They are intended for source installation only.
Binary packages should prefer to use system service mechanism if available.
refs #1488
Change-Id: I09f2168619a47fdc0faa78079b7994f30f41ff75