Update nats client to use yagnats apcera/nats wrapper [#76637390]

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
go fmt ./...

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
Fix/delete some comments in tests

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>