OPNFLWPLUG-952: All links disappear from the topology

OPNFLWPLUG-952: All links disappear from the topology

In cluster split situations LLDP Speaker can get into a bad state, with
incorrect number of node-connectors mapped locally. In some cases
multiple controllers can start sending packet outs. The solution here is
to use clustered DTCL to keep the node-connectors more consistent across
all instances of LLDPSpeaker and use EOS to determine who should
actually transmit the packet.

Change-Id: I36df734dff23688e8ace27b42f85291aa62ac391
Signed-off-by: Evan Zeller <evanrzeller@gmail.com>