Wait for handshake response in Java Client(#3068)

.../java/com/microsoft/signalr/HttpHubConnectionBuilder.java

...lr/src/main/java/com/microsoft/signalr/HubConnection.java

...est/java/com/microsoft/signalr/HandshakeProtocolTest.java

...rc/test/java/com/microsoft/signalr/HubConnectionTest.java

...lr/src/test/java/com/microsoft/signalr/MockTransport.java

...ignalr/src/test/java/com/microsoft/signalr/TestUtils.java