Add fatal to consistency and validation error enums

The code-owners plugin would like to differentiate between normal errors
and fatal errors.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ide55a2ba9ef84fa71604d42caf8cf02c66618ec7
(cherry picked from commit 5001718640)

Documentation/rest-api-config.txt

@@ -1701,7 +1701,7 @@ consistency problem.
 |======================
 |Field Name|Description
 |`status`  |The status of the consistency problem. +
-Possible values are `ERROR` and `WARNING`.
+Possible values are `FATAL`, `ERROR` and `WARNING`.
 |`message` |Message describing the consistency problem.
 |======================
 

java/com/google/gerrit/extensions/api/config/ConsistencyCheckInfo.java

@@ -48,6 +48,7 @@ public class ConsistencyCheckInfo {
 
   public static class ConsistencyProblemInfo {
     public enum Status {
+      FATAL,
       ERROR,
       WARNING,
     }

java/com/google/gerrit/server/git/validators/ValidationMessage.java

@@ -22,6 +22,7 @@ import java.util.Objects;
  */
 public class ValidationMessage {
   public enum Type {
+    FATAL("FATAL: "),
     ERROR("ERROR: "),
     WARNING("WARNING: "),
     HINT("hint: "),
@@ -70,7 +71,7 @@ public class ValidationMessage {
    * Returns {@true} if this message is an error. Used to decide if the operation should be aborted.
    */
   public boolean isError() {
-    return type == Type.ERROR;
+    return type == Type.FATAL || type == Type.ERROR;
   }
 
   @Override