Merge branch '2.2' into 3.0

# Conflicts:
#	requirements.txt
#	setup.py

gns3server/controller/appliance_manager.py

@@ -95,7 +95,7 @@ class ApplianceManager:
         os.makedirs(appliances_path, exist_ok=True)
         return appliances_path
 
-    def builtin_appliances_path(self, delete_first=False):
+    def builtin_appliances_path(self):
         """
         Get the built-in appliance storage directory
         """
@@ -107,8 +107,6 @@ class ApplianceManager:
         else:
             resources_path = os.path.expanduser(resources_path)
         appliances_dir = os.path.join(resources_path, "appliances")
-        if delete_first:
-            shutil.rmtree(appliances_dir, ignore_errors=True)
         os.makedirs(appliances_dir, exist_ok=True)
         return appliances_dir
 
@@ -117,7 +115,7 @@ class ApplianceManager:
         At startup we copy the built-in appliances files.
         """
 
-        dst_path = self.builtin_appliances_path(delete_first=True)
+        dst_path = self.builtin_appliances_path()
         log.info(f"Installing built-in appliances in '{dst_path}'")
         from . import Controller
         try: