Http Component & Http Provider Endpoint do not offer a way to change the Jetty expiration time.

A couple of weeks ago I submitted a patch that added support for Jetty Client Expiration (read timeout) on the Http Provider Endpoint :https://issues.apache.org/activemq/browse/SMXCOMP-717

In most cases it is useful to be able to change the expiration time (the amount of time the endpoint will wait for response) on the component and the provider when using jettyClientPerProvider.

I am attaching a patch that adds a new property called providerExpirationTime on HttpConfiguration and HttpProviderEndpoint.
The patch also updates:
The HttpComponent to save / load the property from the components.property file.
The HttpProviderEndpoint so that it is possible to set this property explicitly per provider.

Finally, it adds a new unit test that tests the above using the following scenarios:
test expiration using providerExpirationTime set on HttpComponent configuration.
test expiration using providerExpirationTime set on the provider.
test no expiration.