* Added interface and socket queries to libcfs (libcfs/linux-tcpip.c). Some

*    Added interface and socket queries to libcfs (libcfs/linux-tcpip.c).  Some
     of this came from socknal_lib-linux.c but was generalised a little so all
     the NALs that use TCP/IP to do connection establishment can use it.

     CAVEAT EMPTOR! Just the linux versions are done; the darwin versions are
     not implemented yet.

     Changed socknal and ranal to use this.

*    Brought ranal up-to-date with new config + mod params for all tunables.
     Ranal gets its local address from the IP of a (single) specified
     interface, or the first "suitable" one found if no interface is specified.