Add occ-dbus object

- The intent behind this commit is to add APIs for dynamically
  createing D-Bus objects.

- When temperature values such as DIMM or Core are monitored, D-Bus
  objects need to be dynamically created and the corresponding
  attribute values updated. If the object path exists, only the
  attribute value needs to be updated.

- Currently supports Sensor and OperationalStatus interfaces.

- Also, added Unit Test to occ_dbus file.

Tested: built openpower-occ-control successfully and UTest pass.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I1eac918d6a7a04d6b72b4e68fff868b04dde9c28
diff --git a/Makefile.am b/Makefile.am
index f3863dd..407815a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -25,6 +25,7 @@
 	occ_errors.cpp \
 	occ_presence.cpp \
 	occ_command.cpp \
+	occ_dbus.cpp \
 	powercap.cpp \
 	org/open_power/OCC/Device/error.cpp \
 	i2c_occ.cpp \