Drop Python 3.4 and switch to async / await syntax for asyncio. Fixes #1425

gns3server/compute/dynamips/nodes/bridge.py

@@ -41,25 +41,23 @@ class Bridge(Device):
         super().__init__(name, node_id, project, manager, hypervisor)
         self._nios = []
 
-    @asyncio.coroutine
-    def create(self):
+    async def create(self):
 
         if self._hypervisor is None:
             module_workdir = self.project.module_working_directory(self.manager.module_name.lower())
-            self._hypervisor = yield from self.manager.start_new_hypervisor(working_dir=module_workdir)
+            self._hypervisor = await self.manager.start_new_hypervisor(working_dir=module_workdir)
 
-        yield from self._hypervisor.send('nio_bridge create "{}"'.format(self._name))
+        await self._hypervisor.send('nio_bridge create "{}"'.format(self._name))
         self._hypervisor.devices.append(self)
 
-    @asyncio.coroutine
-    def set_name(self, new_name):
+    async def set_name(self, new_name):
         """
         Renames this bridge.
 
         :param new_name: New name for this bridge
         """
 
-        yield from self._hypervisor.send('nio_bridge rename "{name}" "{new_name}"'.format(name=self._name,
+        await self._hypervisor.send('nio_bridge rename "{name}" "{new_name}"'.format(name=self._name,
                                                                                           new_name=new_name))
 
         self._name = new_name
@@ -74,8 +72,7 @@ class Bridge(Device):
 
         return self._nios
 
-    @asyncio.coroutine
-    def delete(self):
+    async def delete(self):
         """
         Deletes this bridge.
         """
@@ -83,28 +80,26 @@ class Bridge(Device):
         if self._hypervisor and self in self._hypervisor.devices:
             self._hypervisor.devices.remove(self)
         if self._hypervisor and not self._hypervisor.devices:
-            yield from self._hypervisor.send('nio_bridge delete "{}"'.format(self._name))
+            await self._hypervisor.send('nio_bridge delete "{}"'.format(self._name))
 
-    @asyncio.coroutine
-    def add_nio(self, nio):
+    async def add_nio(self, nio):
         """
         Adds a NIO as new port on this bridge.
 
         :param nio: NIO instance to add
         """
 
-        yield from self._hypervisor.send('nio_bridge add_nio "{name}" {nio}'.format(name=self._name, nio=nio))
+        await self._hypervisor.send('nio_bridge add_nio "{name}" {nio}'.format(name=self._name, nio=nio))
         self._nios.append(nio)
 
-    @asyncio.coroutine
-    def remove_nio(self, nio):
+    async def remove_nio(self, nio):
         """
         Removes the specified NIO as member of this bridge.
 
         :param nio: NIO instance to remove
         """
         if self._hypervisor:
-            yield from self._hypervisor.send('nio_bridge remove_nio "{name}" {nio}'.format(name=self._name, nio=nio))
+            await self._hypervisor.send('nio_bridge remove_nio "{name}" {nio}'.format(name=self._name, nio=nio))
         self._nios.remove(nio)
 
     @property