httpendpoint: Set a dedicated callback to emit signal new-sample signal
httpendpoint: Set a dedicated callback to emit signal new-sample signal

Change-Id: I224a36f72b395c9d583261de58dd475027e84fd4

TribeMedia/kms-core,shelsonjava/kms-core,ESTOS/kms-core,KurentoLegacy/gst-kurento-plugins,ESTOS/kms-core,ESTOS/kms-core,Kurento/kms-core,TribeMedia/kms-core,shelsonjava/kms-core,TribeMedia/kms-core,ESTOS/kms-core,KurentoLegacy/gst-kurento-plugins,Kurento/kms-core,KurentoLegacy/gst-kurento-plugins,KurentoLegacy/gst-kurento-plugins,Kurento/kms-core,shelsonjava/kms-core,shelsonjava/kms-core,TribeMedia/kms-core,Kurento/kms-core