fixed acquireHostList to loadBalancer or hostname alias (#385)

* arangodb-java-driver-384 "java.net.SocketException: Socket closed" when in a cluster mode + Docke...

* arangodb-java-driver-384 remove redundant "connection.close()" statement

Author: wajda

Diff for: src/main/java/com/arangodb/internal/velocystream/VstCommunication.java

@@ -92,6 +92,12 @@ protected synchronized C connect(final HostHandle hostHandle, final AccessType a
                         tryAuthenticate(connection);
                     }
                     hostHandler.confirm();
+                    if (!connection.isOpen()) {
+                        // see https://github.com/arangodb/arangodb-java-driver/issues/384
+                        hostHandler.fail();
+                        host = hostHandler.get(hostHandle, accessType);
+                        continue;
+                    }
                     return connection;
                 } catch (final IOException e) {
                     hostHandler.fail();