playerendopoint: Set appsink elements to playing state
playerendopoint: Set appsink elements to playing state

Change-Id: Ic368a2a899d918ef426349547c997cc3c1a21514

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