Fix IP version field and hop limit in keyed IPv6 tunnel app

The IP version field was set incorrectly.

The default hop limit was changed from 0 to 64 and made configurable.
Update authorized_keys
Merge pull request #226 from korczis/patch-1

Update authorized_keys
Merge pull request #223 from alexandergall/keyed-ipv6-tunnel-fix

Fix IP version field and hop limit in keyed IPv6 tunnel app
[snabbnfv-traffic] Removed a bogus quote.
[neutron-sync-agent] Use SYNC_INTERVAL (and make it default to 1 second).
[snabbnfv-traffic] Use %q instead of '%s' uniformly.
[snabbnfv-traffic] Uncomment debug(?) print/exit.
[snabbnfv-traffic] Call load_config once only on start.