Add utility for D-Bus

Putting all D-Bus related operation to the utils file.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I934e519bca43b73da01ed09fc73f6c7cdc795e1f
diff --git a/Makefile.am b/Makefile.am
index 5edc8f9..4b91f58 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6,7 +6,8 @@
                 led-main.cpp  \
                 manager.cpp \
                 group.cpp \
-                serialize.cpp
+                serialize.cpp \
+                utils.cpp
 
 if !WANTS_JSON
 BUILT_SOURCES = led-gen.hpp