Implement pad_remove function
Implement pad_remove function

Change-Id: I39ff970f0a59756e3f2dc2efc7aba522694649bc

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