httpendpoint: Rename element to appsrc
httpendpoint: Rename element to appsrc

Change-Id: I58d1c1ddb951603038b3e15922d766322de60cb5

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