Add Google Protocol Buffer (protobuf) server support to contrail-collector.
contrail-collector will listen on a UDP port and receive self describing
protobuf messages, process them and add them to the statistics tables in
cassandra. The self describing message format is specified in
src/analytics/self_describing_message.proto.

Change-Id: I6161ff8cd9b4a9c3ca679e9db6d08eb30098f792
Merge "Add Google Protocol Buffer (protobuf) server support to contrail-collector. contrail-collector will listen on a UDP port and receive self describing protobuf messages, process them and add them to the statistics tables in cassandra. The self describing message format is specified in src/analytics/self_describing_message.proto."