tree-wide: sort includes

Sort the includes accoding to the new coding style.

src/test/test-job-type.c

@@ -22,8 +22,8 @@
 #include <stdio.h>
 
 #include "job.h"
-#include "unit.h"
 #include "service.h"
+#include "unit.h"
 
 int main(int argc, char*argv[]) {
         JobType a, b, c, ab, bc, ab_c, bc_a, a_bc;