clean up unused legacy stuff

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

integration_test/etc/alt-config.yaml

@@ -1,31 +0,0 @@
-log:
-  level: trace
-acl_policy_path: ""
-db_type: sqlite3
-ephemeral_node_inactivity_timeout: 30m
-node_update_check_interval: 10s
-ip_prefixes:
-  - fd7a:115c:a1e0::/48
-  - 100.64.0.0/10
-dns_config:
-  override_local_dns: true
-  base_domain: headscale.net
-  magic_dns: true
-  domains: []
-  nameservers:
-    - 127.0.0.11
-    - 1.1.1.1
-db_path: /tmp/integration_test_db.sqlite3
-db_ssl: false
-private_key_path: private.key
-noise:
-  private_key_path: noise_private.key
-listen_addr: 0.0.0.0:18080
-metrics_listen_addr: 127.0.0.1:19090
-server_url: http://headscale:18080
-
-derp:
-  urls:
-    - https://controlplane.tailscale.com/derpmap/default
-  auto_update_enabled: false
-  update_frequency: 1m