pkg/components/metallb: read peer config also from annotations

Which are set by Packet CCM right now.

Refs #548

Signed-off-by: Mateusz Gozdek <mateusz@kinvolk.io>

Author: invidian

pkg/components/metallb/component_test.go

@@ -269,6 +269,10 @@ component "metallb" {
     src-address: metallb.lokomotive.io/src-address
     hold-time: metallb.lokomotive.io/hold-time
     router-id: metallb.lokomotive.io/router-id
+  from-annotations:
+    my-asn: metallb.lokomotive.io/my-asn
+    peer-address: metallb.lokomotive.io/peer-address
+    peer-asn: metallb.lokomotive.io/peer-asn
 address-pools:
 - name: default
   protocol: bgp

pkg/components/metallb/manifests.go

@@ -520,6 +520,10 @@ data:
         src-address: metallb.lokomotive.io/src-address
         hold-time: metallb.lokomotive.io/hold-time
         router-id: metallb.lokomotive.io/router-id
+      from-annotations:
+        my-asn: metallb.lokomotive.io/my-asn
+        peer-address: metallb.lokomotive.io/peer-address
+        peer-asn: metallb.lokomotive.io/peer-asn
     address-pools:
     {{- range $k, $v := .AddressPools }}
     - name: {{ $k }}