CASTOR-5097 RFE: Remove hardcoded castorns default value from nsgetpath

Fixed.

ns/nsgetpath.c

@@ -90,8 +90,8 @@ int main(int argc, char**argv) {
     buf = getconfent (CNS_SCE, "HOST", 0);
   }
   if (buf == NULL) {
-    fprintf(stdout, "Unable to determine which host to contact, used castorns. You can overwrite this with the -h option\n");
-    buf = "castorns";
+    fprintf(stderr, "CNS HOST not set\n");
+    exit (USERR);
   }
   if (errflg || (fileid == 0)) {
     usage (USERR, argv[0]);