MediaSet: Fix repeated pipelines got from ServerManager
MediaSet: Fix repeated pipelines got from ServerManager

Change-Id: I679a48410fdcc1dbe7bf449110401b628d94dcd3

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