camel-http4 component does not respect http.nonProxyHosts

Issue

The Camel http4: endpoint can be configured to use an HTTP proxy, either by properties set on the CamelContext, or on the endpoint itself. The familiar properties http.proxyHost and http.proxyPort are recognized, among others. However, there is no way to specify a list of hosts that are to be excluded from the HTTP proxy -- that is, there is no configuration analogous to the JVM property http.nonProxyHosts.