Fix test

Author: Stephane Landelle

providers/netty3/src/test/java/org/asynchttpclient/providers/netty3/NettyConnectionPoolTest.java

@@ -68,7 +68,7 @@ public boolean isOpen() {
             }
             assertNotNull(exception);
             assertNotNull(exception.getCause());
-            assertEquals(exception.getCause().getMessage(), "Too many connections -1");
+            assertEquals(exception.getCause().getMessage(), "Pool is already closed");
         } finally {
             client.close();
         }

providers/netty4/src/test/java/org/asynchttpclient/providers/netty4/NettyConnectionPoolTest.java

@@ -70,7 +70,7 @@ public boolean isOpen() {
             }
             assertNotNull(exception);
             assertNotNull(exception.getCause());
-            assertEquals(exception.getCause().getMessage(), "Too many connections -1");
+            assertEquals(exception.getCause().getMessage(), "Pool is already closed");
         } finally {
             client.close();
         }