Fix log4cplus error on Agent startup

Moved LogVersionInfo call after initializing log4cplus.

Fixed default log security level in sample agent conf file.

Change-Id: I5cba7a5573d870421c2c0c7f2bb6bd44b897d5a5
Closes-Bug: #1705696

src/vnsw/agent/contrail-vrouter-agent.conf

@@ -43,7 +43,7 @@
 log_file=/var/log/contrail/contrail-vrouter-agent.log
 
 # Log severity levels. Possible values are SYS_EMERG, SYS_ALERT, SYS_CRIT,
-# SYS_ERR, SYS_WARN, SYS_NOTICE, SYS_INFO and SYS_DEBUG. Default is SYS_DEBUG
+# SYS_ERR, SYS_WARN, SYS_NOTICE, SYS_INFO and SYS_DEBUG. Default is SYS_NOTICE
 log_level=SYS_NOTICE
 
 # Enable/Disable local file logging. Possible values are 0 (disable) and 1 (enable)

src/vnsw/agent/contrail/main.cc

@@ -100,17 +100,17 @@ int main(int argc, char *argv[]) {
         init.set_create_vhost(false);
     }
 
-    string build_info;
-    GetBuildInfo(build_info);
-    MiscUtils::LogVersionInfo(build_info, Category::VROUTER);
-
     init.set_agent_param(&params);
     // kick start initialization
     int ret = 0;
     if ((ret = init.Start()) != 0) {
         return ret;
     }
 
+    string build_info;
+    GetBuildInfo(build_info);
+    MiscUtils::LogVersionInfo(build_info, Category::VROUTER);
+
     Agent *agent = init.agent();
     TaskScheduler::GetInstance()->set_event_manager(agent->event_manager());
     agent->event_manager()->Run();