Transpose expected and actual, and remove duplicate info from message.

Previously:
```
   > Throwable #1: java.lang.AssertionError: Expected all shards successful but got successful [8] total [9]
   > Expected: <8>
   >      but: was <9>
```

Now:
```
   > Throwable #1: java.lang.AssertionError: Expected all shards successful
   > Expected: <9>
   >      but: was <8>
```

test/framework/src/main/java/org/elasticsearch/test/hamcrest/ElasticsearchAssertions.java

@@ -347,15 +347,15 @@ public static void assertNoFailures(BroadcastResponse response) {
 
     public static void assertAllSuccessful(BroadcastResponse response) {
         assertNoFailures(response);
-        assertThat("Expected all shards successful but got successful [" + response.getSuccessfulShards() + "] total [" + response.getTotalShards() + "]",
-                response.getTotalShards(), equalTo(response.getSuccessfulShards()));
+        assertThat("Expected all shards successful",
+                response.getSuccessfulShards(), equalTo(response.getTotalShards()));
         assertVersionSerializable(response);
     }
 
     public static void assertAllSuccessful(SearchResponse response) {
         assertNoFailures(response);
-        assertThat("Expected all shards successful but got successful [" + response.getSuccessfulShards() + "] total [" + response.getTotalShards() + "]",
-                response.getTotalShards(), equalTo(response.getSuccessfulShards()));
+        assertThat("Expected all shards successful",
+                response.getSuccessfulShards(), equalTo(response.getTotalShards()));
         assertVersionSerializable(response);
     }