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This extends the endpoint struct for swig so the generated
code will call oc_new_endpoint and oc_free_endpoint when
new and finalize are called.

Endpoint(s) are set to NULL after calling oc_free_endpoint or
oc_free_server_endpoints is called from Java. This will prevent
double freeing memory which would result in a segfault.

code that returns or accept multiple endpoints in a list now
indicate that fact because the variable name is plural
'endpoints'

Change-Id: Id11a1c98e724bf44b7ab82e92a529f3859f6e936
Signed-off-by: George Nash <george.nash@intel.com>