@After
  public void teardown() throws Exception {
    selector.close();
    server.close();
    trustStoreFile.delete();
  }
@param sslContextProvider the name of the SSL library provider to use.
@param poolSize the size of the worker pool for reading/writing/connecting to sockets.
@param useDirectBuffers true to allocate direct buffers in {@link SSLTransmission}.
@throws Exception
ambry-network/src/test/java/com/github/ambry/network/SSLSelectorTest.java