In the scope of VOL-1595, multicast GEM port definitions
shall be read from the technology profile. Both Multicast
and VOD downstream GEM port definitions shall be read from
"downstream_gem_port_attribute_list" tag.

A sample downstream_gem_port_attribute_list JSON can be found in
"Changes to be made in VOLTHA/Open OMCI Adapter" section of the
Multicast Design Document for SEBA
(https://docs.google.com/document/d/1FNwkcDeVB3C2SpTJP_QrYTlC6sYFo_xwQnxASMk9x2U)

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