DESDL: Support multiple service defs per DESDL Binding

From today's discussion, we should also add support for adding dynamic ESDL method to a static esdl service. 

Yanrui assigning to you. Notice we may be extending the scope to allow new ports to be added dynamically as well. Needs discussion though.

It's also come up that maybe we should allow new DESDL ports to be added dynamically as well.

As far as implementation goes, ESP maintains a data structure that keeps track of what bindings have been loaded. It walks that list for routing and other purposes. Part of this new feature will most likely need to have an instance of dynamic esdl be able to expand (or contract) that internal ESP datastructure at run time.

when I run "esdl bind-service myesp 8888 people.1 --config = people_config.xml" a virtual "WsPeopleBinding" should be inserted in the list.
The same for "WsAddressesBinding".

But unlike static ESP binding entries, which generally would each point to a unique object representing the binding type

Dynamic binding entries on the same port would point to the same object

That's the concept anyway. If there turns out to be an easier way to map the virtual bindings, we can discuss it.

Looking at ConfigMgr

You would find :
Under ESP Service, 1 instance of dynamicesdl.
Under Esp - myesp (the process) you would find 1 dynamic esdl ESP binding on port 8888.