Temporary fix for the eventloop leak.

 RxNetty.createHttpClient() creates a new Http Client which creates a brand new eventloop.
 RxNetty provides a way to override the eventloop through the client builder. This temporary fix uses the builder directly and hence a common eventloop for all clients.

 After RxNetty's issue https://github.com/Netflix/RxNetty/issues/89 gets fixed we can use RxNetty.createHttpClient() again.

 Also, removed lambdas from EdgeServer, for some reason I do not understand, my java8 compiler does not like the types used in the lambdas.