s20190515
ninfod: Node Information Query (RFC4620) daemon from USAGI Project.
ping, ninfod: merge network information constants
Use the value of sbindir to install rinfod, rarpd & ninfod
clockdiff, rdisc, ninfod: get rid of vla's
ninfod: remove suptypes and ttl code
misc: fix couple typos
arping, ninfod, ping: tidy cppcheck warnings
common: use single ARRAY_SIZE definition across files