added 'const' to function prototype vars where possible

Added the 'const' qualifier to function prototype variables where possible.
In addition, reduced some functions to file-scope with 'static' where possible.

Also made a few minor changes to remove extra whitespace, and fixed a bug
in create_fwknoprc() to ensure the new fwknoprc filehandle is closed.

server/utils.c

@@ -34,7 +34,7 @@
 /* Generic hex dump function.
 */
 void
-hex_dump(unsigned char *data, int size)
+hex_dump(const unsigned char *data, const int size)
 {
     int ln, i, j = 0;
     char ascii_str[17] = {0};