Adjust the init order when creating firewall cube object so the parameter passed

by user can be populated, the will also avoid the crash due to object reference
before object initialization.

Author: goldenrye

src/services/pcn-firewall/src/Firewall.cpp

@@ -22,7 +22,6 @@ Firewall::Firewall(const std::string name, const FirewallJsonObject &conf)
   logger()->set_pattern("[%Y-%m-%d %H:%M:%S.%e] [Firewall] [%n] [%l] %v");
   logger()->info("Creating Firewall instance");
 
-  update(conf);
 
   /*Creating default INGRESS and EGRESS chains.*/
   ChainJsonObject chain;
@@ -73,6 +72,8 @@ Firewall::Firewall(const std::string name, const FirewallJsonObject &conf)
   egress_programs[ModulesConstants::CONNTRACKTABLEUPDATE] =
     new Firewall::ConntrackTableUpdate(ModulesConstants::CONNTRACKTABLEUPDATE,
                                        ChainNameEnum::EGRESS, *this);
+
+  update(conf);
 }
 
 Firewall::~Firewall() {