Send post data to discovery server as JSON
Send post data to discovery server as JSON

Change-Id: I02e975f22f0ffd8340a22aeca2cb02d861339f29
Fixes-Bug: #1603231

codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller