Add the network utility file

Moving utility functions from network manager to
util.cpp.

Added few more utility functions.

Change-Id: I2e73c873e9a3bea543d6979463b2181e8374e12e
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
diff --git a/Makefile.am b/Makefile.am
index 6c5aec9..f2a9174 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,7 +15,8 @@
 		network_config.hpp \
 		network_manager.hpp \
 		ipaddress.hpp \
-		types.hpp
+		types.hpp \
+		util.hpp
 
 phosphor_network_manager_SOURCES = \
 		ethernet_interface.cpp \
@@ -24,7 +25,8 @@
 		network_manager.cpp \
 		network_manager_main.cpp \
 		xyz/openbmc_project/Network/VLAN/Create/server.cpp \
-		xyz/openbmc_project/Network/IP/Create/server.cpp
+		xyz/openbmc_project/Network/IP/Create/server.cpp \
+		util.cpp
 
 CLEANFILES = \
 		xyz/openbmc_project/Network/VLAN/Create/server.cpp \