[FIXED] Incorrect RAFT logging.
[FIXED] Incorrect RAFT logging.

- Some of raft headers were truncated (ft-net instead of raft-net)
- RAFT debug level were traced as streaming trace level.

Resolves #986

Signed-off-by: Ivan Kozlovic <a15f8b81a160b4eebe5c84e9e3b65c87b9b2f18e@synadia.com>

nats-io/nats-streaming-server,nats-io/nats-streaming-server