Implement replicaLoadBalancer boolean flag. (#38)

The flag adds a replica service with the name cluster_name-repl and
a DNS name that defaults to {cluster}-repl.{team}.{hostedzone}.

The implementation converted Service field of the cluster into a map
with one or two elements and deals with the cases when the new flag
is changed on a running cluster
(the update and the sync should create or delete the replica service).
In order to pick up master and replica service and master endpoint
when listing cluster resources.

* Update the spec when updating the cluster.

pkg/util/constants/aws.go

@@ -2,8 +2,11 @@ package constants
 
 import "time"
 
+// AWS specific constants used by other modules
 const (
-	AWS_REGION       = "eu-central-1"
+	// default region for AWS. TODO: move it to the operator configuration
+	AWS_REGION = "eu-central-1"
+	// EBS related constants
 	EBSVolumeIDStart = "/vol-"
 	EBSProvisioner   = "kubernetes.io/aws-ebs"
 	//https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_VolumeModification.html