Enable faulthandler to provide more fault information

src/sonic_ax_impl/__init__.py

@@ -1,9 +1,13 @@
 import json
 import logging.handlers
-
+import faulthandler
 
 # configure logging
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.INFO)
 logger.addHandler(logging.NullHandler())
 
+# enable faulthandler to provide more information for debug
+# after enable faulthandler, the file 'stderr' will be remembered by faulthandler:
+# https://docs.python.org/dev/library/faulthandler.html#issue-with-file-descriptors
+faulthandler.enable()