Kubernetes uses SPDY/3.1 which is incompatible with HTTP/2, disable it
in the transport and server.
Fixes#7645Fixes#7646
Signed-off-by: Maisem Ali <maisem@tailscale.com>
We were not handling tags at all, pass them through as Impersonate-Group headers.
And use the FQDN for tagged nodes as Impersonate-User.
Updates #5055
Signed-off-by: Maisem Ali <maisem@tailscale.com>