Merge branch '1232-handshake-manager' into 'master'

Implement handshake protocol

See merge request briar/briar!1118

briar-core/src/test/java/org/briarproject/briar/test/TestStreamWriter.java

@@ -1,25 +0,0 @@
-package org.briarproject.briar.test;
-
-import org.briarproject.bramble.api.transport.StreamWriter;
-
-import java.io.IOException;
-import java.io.OutputStream;
-
-class TestStreamWriter implements StreamWriter {
-
-	private final OutputStream out;
-
-	TestStreamWriter(OutputStream out) {
-		this.out = out;
-	}
-
-	@Override
-	public OutputStream getOutputStream() {
-		return out;
-	}
-
-	@Override
-	public void sendEndOfStream() throws IOException {
-		out.flush();
-	}
-}