Implement an api call for computing the IDLE PC

Fix https://github.com/GNS3/gns3-gui/pull/2153

gns3server/controller/__init__.py

@@ -597,3 +597,24 @@ class Controller:
         if not hasattr(Controller, '_instance') or Controller._instance is None:
             Controller._instance = Controller()
         return Controller._instance
+
+    @asyncio.coroutine
+    def autoidlepc(self, compute_id, platform, image):
+        """
+        Compute and IDLE PC value for an image
+
+        :param compute_id: ID of the compute where the idlepc operation need to run
+        :param platform: Platform type
+        :param image: Image to use
+        """
+        compute = self.get_compute(compute_id)
+        for project in list(self._projects.values()):
+            if project.name == "AUTOIDLEPC":
+                yield from project.delete()
+                self.remove_project(project)
+        project = yield from self.add_project(name="AUTOIDLEPC")
+        node = yield from project.add_node(compute, "AUTOIDLEPC", str(uuid.uuid4()), node_type="dynamips", platform=platform, image=image, ram=512)
+        res = yield from node.dynamips_auto_idlepc()
+        yield from project.delete()
+        self.remove_project(project)
+        return res

gns3server/controller/compute.py

@@ -665,3 +665,4 @@ class Compute:
                     return (this_interface["ip_address"], other_interface["ip_address"])
 
         raise ValueError("No common subnet for compute {} and {}".format(self.name, other_compute.name))
+