kmsfilterelement: Manage data channels in passthrough mode
kmsfilterelement: Manage data channels in passthrough mode

Change-Id: Ie67d776b545358d330b26598d399e21d2abc58ef

shelsonjava/kms-core,TribeMedia/kms-core,ESTOS/kms-core,TribeMedia/kms-core,Kurento/kms-core,TribeMedia/kms-core,shelsonjava/kms-core,shelsonjava/kms-core,Kurento/kms-core,Kurento/kms-core,shelsonjava/kms-core,ESTOS/kms-core,Kurento/kms-core,TribeMedia/kms-core,ESTOS/kms-core,ESTOS/kms-core