Remove generics from EchoServer sample.
Remove generics from EchoServer sample.

AlwaysRightInstitute/SwiftSockets,adrianomazucato/SwiftSockets,AlwaysRightInstitute/SwiftSockets,AlwaysRightInstitute/SwiftSockets,adrianomazucato/SwiftSockets,luosheng/SwiftSockets,luosheng/SwiftSockets