Python2 compatibility generator_containers.py

[dmfigol]

I am using the module on IOS XE Guest Shell with python2 only.
This API call fails, because __qualname__ is available only in Python3.

>>> spark_api.rooms.list()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/ciscosparkapi/generator_containers.py", line 70, in __repr__
    func_name=self.generator_function.__qualname__,
AttributeError: 'function' object has no attribute '__qualname__'

[cmlccie]

@dmfigol I have correct this compatibility issue in ciscosparkapi v0.10.1 and webexteamssdk v1.1.1. Let me know if you have any issues after updating to these versions.