[CONNECT-291] Pass OnApp CP HTTP response through to caller.

cocci/occiserver.c
Altered: "occi_content_type()" to check start of Accept header.

oaprocci/oacontract.c
Altered: "handle_alert()" not to add 4000 to response status;
"do_onapp_action()" to handle alert by populating rest_response for subsequent alert processing;
"create_onapp_vm()" to ignore onapp->state;
"stop_onapp()" to ignore onapp->state and not add 4000 to response status;
"start_onapp()", "shutdown_onapp()", "delete_onapp_contract() to ignore onapp->state;
"close_cords_onapp_extras_handle()" to clear "ponapp_extras".