Delete{Reviewer|Vote}: Make permission error more specific

Change-Id: I7d059601c5087f8f7162cca3d1de89db08ffec58

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/change/ChangeIT.java

@@ -752,7 +752,7 @@ public class ChangeIT extends AbstractDaemonTest {
 
     setApiUser(user);
     exception.expect(AuthException.class);
-    exception.expectMessage("delete not permitted");
+    exception.expectMessage("delete reviewer not permitted");
     gApi.changes()
         .id(r.getChangeId())
         .reviewer(admin.getId().toString())
@@ -869,7 +869,7 @@ public class ChangeIT extends AbstractDaemonTest {
 
     setApiUser(user);
     exception.expect(AuthException.class);
-    exception.expectMessage("delete not permitted");
+    exception.expectMessage("delete vote not permitted");
     gApi.changes()
         .id(r.getChangeId())
         .reviewer(admin.getId().toString())

gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteReviewer.java

@@ -163,7 +163,7 @@ public class DeleteReviewer implements RestModifyView<ReviewerResource, Input> {
                 .append("\n");
           }
         } else {
-          throw new AuthException("delete not permitted");
+          throw new AuthException("delete reviewer not permitted");
         }
       }
 

gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteVote.java

@@ -173,7 +173,7 @@ public class DeleteVote
             break;
           }
         } else {
-          throw new AuthException("delete not permitted");
+          throw new AuthException("delete vote not permitted");
         }
       }
       if (psa == null) {