Refactor tests for RESTeasy-netty4

- Use @Before and @After to build/close client.
- REQUEST_TIMEOUT constant for timeout assertions.
- Use @Test(timeout=REQUEST_TIMEOUT)
Add assertions for StreamingoutputTest for RESTeasy-netty4.
RESTeasy-netty4 Remove printlns to terminal in tests.
Merge pull request #514 from sajmoon/resteasy-netty4-test

Resteasy netty4 test