Fixed exception messages

Otherwise TCK tests fail.

Author: lutovich

driver/src/main/java/org/neo4j/driver/internal/InternalStatementResult.java

@@ -106,7 +106,7 @@ public Record single()
 
             if ( hasMoreThanOne )
             {
-                throw new NoSuchRecordException( "Expected result with a single record, but it contains " +
+                throw new NoSuchRecordException( "Expected a result with a single record, but this result contains " +
                                                  "at least one more. Ensure your query returns only one record." );
             }
 

driver/src/main/java/org/neo4j/driver/internal/async/InternalStatementResultCursor.java

@@ -99,8 +99,9 @@ public CompletionStage<Record> singleAsync()
             {
                 if ( secondRecord != null )
                 {
-                    throw new NoSuchRecordException( "Expected cursor with a single record, but it contains " +
-                                                     "at least one more. Ensure your query returns only one record." );
+                    throw new NoSuchRecordException( "Expected a cursor with a single record, but this cursor " +
+                                                     "contains at least one more. Ensure your query returns only " +
+                                                     "one record." );
                 }
                 return firstRecord;
             } );

driver/src/test/java/org/neo4j/driver/v1/integration/SessionAsyncIT.java

@@ -588,7 +588,7 @@ public void shouldFailSingleWithMultiRecordCursor()
         }
         catch ( NoSuchRecordException e )
         {
-            assertThat( e.getMessage(), startsWith( "Expected cursor with a single record" ) );
+            assertThat( e.getMessage(), startsWith( "Expected a cursor with a single record" ) );
         }
     }
 

driver/src/test/java/org/neo4j/driver/v1/integration/TransactionAsyncIT.java

@@ -694,7 +694,7 @@ public void shouldFailSingleWithMultiRecordCursor()
         }
         catch ( NoSuchRecordException e )
         {
-            assertThat( e.getMessage(), startsWith( "Expected cursor with a single record" ) );
+            assertThat( e.getMessage(), startsWith( "Expected a cursor with a single record" ) );
         }
     }