Improve deploy messages

Remove misleading prefix of some deploy messages

parent-host-not-ready:
  0/1 hosts for vespa.album-recommendation.default-t have completed
  provisioning and bootstrapping, still waiting for
  h33908.staging.aws-us-east-1c.vespa-external-cd.aws.oath.cloud

load-balancer-not-ready:
  Failed to (re)configure load balancer for CLUSTER in APPLICATION,
  targeting: REALS. The operation will be retried on next deployment

out-of-capacity one of:
  Could not satisfy request for 3 nodes with...
  Not enough capacity to start 3 r4.xlarge instances...
  No host flavor matches [vcpu: 2, memory: ...], nearest matching host flavor...

1 files changed, 11 insertions, 4 deletions

diff --git a/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/configserver/ConfigServerException.java b/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/configserver/ConfigServerException.java
index 780969206a2..4240b0d9fa6 100644
--- a/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/configserver/ConfigServerException.java
+++ b/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/configserver/ConfigServerException.java
@@ -2,6 +2,7 @@
 package com.yahoo.vespa.hosted.controller.api.integration.configserver;
 
 import java.net.URI;
+import java.util.Objects;
 
 /**
  * @author Tony Vaagenes
@@ -10,11 +11,13 @@ public class ConfigServerException extends RuntimeException {
 
     private final URI serverUri;
     private final ErrorCode errorCode;
+    private final String serverMessage;
 
-    public ConfigServerException(URI serverUri, String message, ErrorCode errorCode, Throwable cause) {
-        super(message, cause);
-        this.serverUri = serverUri;
-        this.errorCode = errorCode;
+    public ConfigServerException(URI serverUri, String context, String serverMessage, ErrorCode errorCode, Throwable cause) {
+        super(context + ": " + serverMessage, cause);
+        this.serverUri = Objects.requireNonNull(serverUri);
+        this.errorCode = Objects.requireNonNull(errorCode);
+        this.serverMessage = Objects.requireNonNull(serverMessage);
     }
 
     public ErrorCode getErrorCode() {
@@ -25,6 +28,10 @@ public class ConfigServerException extends RuntimeException {
         return serverUri;
     }
 
+    public String getServerMessage() {
+        return serverMessage;
+    }
+
     // TODO: Copied from Vespa. Expose these in Vespa and use them here
     public enum ErrorCode {
         APPLICATION_LOCK_FAILURE,