daemonize: switch the pid and log file arguments

The caller and the definition had them swapped.. So it was logging to
the PID file and writing the PID to the log file..

src/daemonize.rs

@@ -10,8 +10,8 @@ use std::path::Path;
 // MIT licensed according to https://github.com/jedisct1/rust-daemonize-simple/blob/master/Cargo.toml
 pub unsafe fn daemonize(
     chdir: &Path,
-    pid_file: &Path,
     log_file: &Path,
+    pid_file: &Path,
 ) -> Result<(), &'static str> {
     match libc::fork() {
         -1 => return Err("fork() failed"),