Supplied Jetty version (9.1.1.v20140108) doesn't set Date header.

Using the supplied jetty (9.1.1.v20140108) no Date header are returned in responses. Solution is to update Jetty version. This override makes Date header work again:

```
9.2.13.v20150730
```

And

```

org.glassfish.jersey.containers
jersey-container-jetty-servlet


org.glassfish.jersey.containers
jersey-container-jetty-http

org.eclipse.jetty
jetty-server

org.eclipse.jetty
jetty-webapp

org.eclipse.jetty
jetty-util

org.eclipse.jetty
jetty-continuation

org.eclipse.jetty
jetty-server
${jetty.version}


org.eclipse.jetty
jetty-webapp
${jetty.version}


org.eclipse.jetty
jetty-util
${jetty.version}

```
#### Affected Versions
[2.21]