Factor frr role from debian, ceph and proxmox

Consolidate base system and networking setup into debian role and BGP
configuration into frr role. Add facts role to collect data from NetBox
once to avoid many slow lookups. Also many other tweaks and cleanups.

roles/frr/templates/frr.conf.j2

@@ -0,0 +1,46 @@
+frr defaults datacenter
+service integrated-vtysh-config
+log syslog
+
+# we only have the default route, so allow talking to BGP peers over it
+ip nht resolve-via-default
+
+router bgp {{ asn.asn }}
+  bgp bestpath as-path multipath-relax
+
+  neighbor fabric peer-group
+  neighbor fabric remote-as external
+  neighbor fabric capability extended-nexthop
+
+{% for iface in interfaces | selectattr('name', 'match', '^lan') %}
+  neighbor {{ iface.name }} interface peer-group fabric
+  neighbor {{ iface.name }} bfd
+{% endfor %}
+
+  address-family ipv4 unicast
+    redistribute connected route-map loopback
+    neighbor fabric activate
+    neighbor fabric route-map local out
+  exit-address-family
+
+  address-family ipv6 unicast
+    redistribute connected route-map loopback
+    neighbor fabric activate
+    neighbor fabric route-map local out
+  exit-address-family
+
+{% if cluster.custom_fields and cluster.custom_fields.vlans %}
+  address-family l2vpn evpn
+    neighbor fabric activate
+    neighbor fabric route-map local out
+    advertise-all-vni
+  exit-address-family
+{% endif %}
+
+bgp as-path access-list local permit ^$
+
+route-map loopback permit 1
+  match interface lo
+
+route-map local permit 1
+  match as-path local