httpendpoint: Set dts to CLOCK_TIME_NONE
httpendpoint: Set dts to CLOCK_TIME_NONE

Now we only use pts to avoid problems of pts and dts mixing that can
cause problems while recording.

Change-Id: I72b394a7ba236bcf897fb9b83ef918933be449b7

TribeMedia/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,shelsonjava/kms-elements