ClusterManager: Implements support of remote clusters.

After this change users will be able to:
* Create cluster and add/remove servers to it
* Install apps on remote cluster
* Move already installed apps between clusters
* Apps running on server being removed will auto-migrate
  to another server from that same cluster

This is achieved by:
* Installing and running minimal version of dodo on remote cluster
* Ingress-nginx is installed automatically on new clusters
* Next to nginx we run VPN client in the same pod, so that
  default cluster can establish secure communication with it
* Multiple reverse proxies are configured to get to the
  remote cluster service from ingress installed on default cluster.

Next steps:
* Support remote clusters in dodo apps (prototype ready)
* Clean up old cluster when moving app to the new one. Currently
  old cluster keeps running app pods even though no ingress can
  reach it anymore.

Change-Id: Iffc908c93416d4126a8e1c2832eae7b659cb8044
diff --git a/charts/ingress/templates/install.yaml b/charts/ingress/templates/install.yaml
index c50a741..edae330 100644
--- a/charts/ingress/templates/install.yaml
+++ b/charts/ingress/templates/install.yaml
@@ -3,8 +3,10 @@
 metadata:
   name: ingress-{{ .Values.domain }}
   namespace: {{ .Release.Namespace }}
-  {{- if or .Values.certificateIssuer .Values.appRoot }}
   annotations:
+    {{- if .Values.annotations }}
+    {{ toYaml .Values.annotations | nindent 4 }}
+    {{- end }}
     {{- if .Values.certificateIssuer }}
     acme.cert-manager.io/http01-edit-in-place: "true"
     cert-manager.io/cluster-issuer: {{ .Values.certificateIssuer }}
@@ -13,7 +15,6 @@
     {{- if .Values.appRoot }}
     nginx.ingress.kubernetes.io/app-root: {{ .Values.appRoot }}
     {{- end }}
-  {{- end }}
 spec:
   ingressClassName: {{ .Values.ingressClassName }}
   {{- if .Values.certificateIssuer }}
diff --git a/charts/ingress/values.yaml b/charts/ingress/values.yaml
index 0640557..20c1eb8 100644
--- a/charts/ingress/values.yaml
+++ b/charts/ingress/values.yaml
@@ -7,3 +7,4 @@
   port:
     number: 80
     name: ""
+annotations: {}