Added SubscribeForMetadata() to the sarama client, to access the header field of each received message.

Also replaced TestKafkaClientImplementsKafkaClientIf() with static checks.

For VOL-2207.  Please consider these related patchsets together:
https://gerrit.opencord.org/#/q/VOL-2207

Change-Id: I77f03fbb0ebcdf60cb5f8d0c8c3276325510e874
6 files changed