Add router role for prodnxsr0020 (#536)

prodnxsr0020 runs FRR/OSPF hand-configured; bring its routing config under puppet without touching interfaces, firewall or dnsmasq.

- add roles::infra::network::router (base + frrouting + frr_exporter)
- enable ip_forward and disable rp_filter via sysctl::base
- add prodnxsr0020 OSPF config (dum0, dum1, bond0.201; src 198.18.21.160)
- pin dns, consul and router-id to dum0 instead of the WAN-facing primary IP
- listen sshd on 127.0.0.1 and dum0 only, knocking out the common WAN primary IP
- keep resolv.conf on the local dnsmasq (127.0.0.1)

Reviewed-on: #536
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

site/roles/manifests/infra/network/router.pp

@@ -0,0 +1,12 @@
+# roles::infra::network::router
+# an ospf router; frr only, interfaces and firewall are managed outside puppet
+#
+class roles::infra::network::router {
+  if $facts['firstrun'] {
+    include profiles::defaults
+    include profiles::firstrun::init
+  }else{
+    include profiles::defaults
+    include profiles::base
+  }
+}