Remove support for non-noise clients (pre-1.32) (#1611)

config-example.yaml

@@ -40,19 +40,12 @@ grpc_listen_addr: 127.0.0.1:50443
 # are doing.
 grpc_allow_insecure: false
 
-# Private key used to encrypt the traffic between headscale
-# and Tailscale clients.
-# The private key file will be autogenerated if it's missing.
-#
-private_key_path: /var/lib/headscale/private.key
-
 # The Noise section includes specific configuration for the
 # TS2021 Noise protocol
 noise:
   # The Noise private key is used to encrypt the
   # traffic between headscale and Tailscale clients when
-  # using the new Noise-based protocol. It must be different
-  # from the legacy private key.
+  # using the new Noise-based protocol.
   private_key_path: /var/lib/headscale/noise_private.key
 
 # List of IP prefixes to allocate tailaddresses from.
@@ -95,6 +88,12 @@ derp:
     # For more details on how this works, check this great article: https://tailscale.com/blog/how-tailscale-works/
     stun_listen_addr: "0.0.0.0:3478"
 
+    # Private key used to encrypt the traffic between headscale DERP
+    # and Tailscale clients.
+    # The private key file will be autogenerated if it's missing.
+    #
+    private_key_path: /var/lib/headscale/derp_server_private.key
+
   # List of externally available DERP maps encoded in JSON
   urls:
     - https://controlplane.tailscale.com/derpmap/default