TODO ADD TESTS riotnode: Remove exception context from inside pexpect…

… implementation

TODO:
* add tests
* Try to make as if the exception was raised from one level on top!
  So without even being in the `TermSpawn` implementation

This allows having a nicely printed output on `pytest`.
This could be moved outside of here too.

dist/pythonlibs/riotnode/riotnode/node.py

@@ -25,6 +25,7 @@ class TermSpawn(pexpect.spawn):
       * default timeout
     * tweak exception:
       * replace the value with the called pattern
+      * remove exception context from inside pexpect implementation
     """
 
     def __init__(self,  # pylint:disable=too-many-arguments
@@ -53,9 +54,14 @@ def _pexpect_exception(exc, pattern):
         """Tweak pexpect exception.
 
         * Put the calling 'pattern' as value
+        * Remove exception context
         """
         exc.pexpect_value = exc.value
         exc.value = pattern
+
+        # Remove exception context
+        exc.__cause__ = None
+        exc.__traceback__ = None
         return exc