[fw] broadcast/replicast forwarding strategy + best-route override

[r2dev2]

• fixes bug in bestroute forwarding ER tagging where ER was out of sync with nexthop after sort
• refactors strategy interface to take in a list of tuple of nexthop/ER
• override to setting the strategy to best-route when ER tag is detected (see slide 16) - behavior might be reconsidered in future, but keep for now
• implements broadcast forwarding strategy to forward interest packet to all next hops
• implements replicast forwarding strategy (n interest packets sent to n unique egress routers)
• changes router to use broadcast forwarding in its advertisement interests and for localhop advertisement svs
• test_005.py - test replicast with svs sync using alo-latest application (bug fixed in alo-latest as well)