Connect consumer and TV

CecTv class updates old TV class
app/hdmi_cec_node runs Discoveree and CecTv
app/consumer sends interest to app/hdmi_cec_node
(which both currently run on same node)

Currently known bug: NFD forwarding
Next commit will temporarily fix
NFD forwarding hack

When consumer sends interest for "/home/dev" while hdmi_cec_node is running
locally, the interest is forwarded only to hdmi_cec_node instead of the
multicast face (forwarding on "/home") because NFD does longest prefix matching

All changes noted with "# TODO: NFD hack:"
Merge branch 'modularizeConsumerTv'
Merge branch 'master' of github.com:remap/ndn-pi