Create memberlist secret

In metallb#527, HashiCorp memberlist support was added, which requires a
secret to be present in the metallb-system namespace. We need to
create this secret in the dev environment for speakers to converge.

tasks.py

@@ -211,7 +211,22 @@ def dev_env(ctx, architecture="amd64", name="kind", cni=None):
             f.write(manifest)
             f.flush()
 
+        # Create memberlist secret.
+        secret = """---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: memberlist
+  namespace: metallb-system
+stringData:
+  secretkey: verysecurelol"""
+
+        with open(tmpdir + "/secret.yaml", "w") as f:
+            f.write(secret)
+            f.flush()
+
         run("kubectl apply -k {}".format(tmpdir), echo=True)
+        run("kubectl apply -f {}/secret.yaml".format(tmpdir), echo=True)
 
     with open("e2etest/manifests/mirror-server.yaml") as f:
         manifest = f.read()