Modify KmsElement plugin initialization to be as other ones
Modify KmsElement plugin initialization to be as other ones

Change-Id: I51fb145ab7b09a35f3ad8e6765ef02e7cd058487

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