Change I/O log API to pass in command info to the I/O log open function.

Add iolog_file and iolog_dir parameters to command info.
This allows the policy plugin to specify the I/O log pathname.
Add convenience functions for calling plugin functions that
handle ABI backwards compatibility.

src/sudo.h

@@ -138,6 +138,8 @@ struct command_details {
     const char *chroot;
     const char *selinux_role;
     const char *selinux_type;
+    const char *iolog_dir;
+    const char *iolog_file;
 };
 
 /* Status passed between parent and child via socketpair */