Injected client beans should close the client when the bean is destroyed

When using a CDI to inject a REST Client bean, the backing client is never closed resulting in warning messages like:
```
WARN: RESTEASY004687: Closing a class org.jboss.resteasy.client.jaxrs.engines.ManualClosingApacheHttpClient43Engine$CleanupAction instance for you. Please close clients yourself.
```

This could be avoided by closing the backing client when the bean id destroyed.