mediaSet: Add a global fixture to inicialize modules just once
mediaSet: Add a global fixture to inicialize modules just once

Change-Id: I795f6b6f79c81f8499c6203e8544e78db0ce5685

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