Merge branch '2.2' into 3.0

# Conflicts:
#	gns3server/controller/__init__.py
#	gns3server/crash_report.py
#	gns3server/handlers/api/controller/node_handler.py
#	gns3server/utils/images.py

gns3server/utils/images.py

@@ -247,6 +247,7 @@ def md5sum(path, working_dir=None, stopped_event=None, cache_to_md5file=True):
 
     try:
         m = hashlib.md5()
+        log.debug(f"Calculating MD5 sum of `{path}`")
         with open(path, "rb") as f:
             while True:
                 if stopped_event is not None and stopped_event.is_set():