Deferred produce exception.

Current code has type bug on DeferCache.
We are specify type of value which will be stored in local cache as Deferred[QueryResult] but actual fetchInner expect Deferred[QueryRequestWithResult] in AsynchbaseStorage.scala.

This only occur when queryParam has cacheTTL option.

wrong type.

private val futureCache = new DeferCache[QueryResult](config)(ec)

right type.

private val futureCache = new DeferCache[QueryRequestWithResult](config)(ec)

also caller of this futureCache variable need to be changed according to right type.