- fix "error: missing initializer for member 'in_addr::"
 - it is not necessary to initialize the in_addr struct before
   using Ndb_getInAddr(), the function will return a properly
   initialized value.
 - also fix problem with how failure is returned from Ndb_inet_ntop(),
   add unit test for checking failure handling of function.
 - remove lots of uneccessary casts by changing Ndb_inet_ntop() to
   take size_t instead of socklen_t