NSE: rpc-grind Connect(): RPC library does not support: nil protocol
NSE: rpc-grind Connect(): RPC library does not support: rpcbind version
81578896
These errors caused by ChkProgram and ChkVersion called from
rpc.Comm.Connect. Added a dummy program in rpc-grind and a check for
self.checkprogver in ChkVersion, and everything works great.
Also fixed portrule to only fail if the non-rpcbind service name was not
the result of table lookup. Was failing on port 2049 (in nmap-services
as "nfs") without -sV.