kmsbasertpendpoint: set RTP payloader MTU size to 1200
kmsbasertpendpoint: set RTP payloader MTU size to 1200

Change-Id: I78610e2d0a13f7b3479bd6c445c4246b1ddd0355

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