pgm_transport_leave_group now updates internal receiver group/source/interface list.
pgm_transport_leave_group now updates internal receiver group/source/interface list.


jdelgadoalfonso/openpgm,jdelgadoalfonso/openpgm,jdelgadoalfonso/openpgm,jdelgadoalfonso/openpgm,jdelgadoalfonso/openpgm,jdelgadoalfonso/openpgm