Type error in middleware ext_context python3

[DavidPurcell]

When writing unit tests for api middleware, encountered this bug when running python3.4 tests:

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    b'Traceback (most recent call last):'
    b' File "/opt/stack/murano/murano/tests/unit/api/middleware/test_ext_context.py", line 43, in test_middleware_ext_context_default'
    b' middleware.process_request(request)'
    b' File "/opt/stack/murano/murano/api/middleware/ext_context.py", line 94, in process_request'
    b" user, password = credentials.split(':', 2)"
    b"TypeError: 'str' does not support the buffer interface"
    b''

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/372899

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/372899
Committed: https://git.openstack.org/cgit/openstack/murano/commit/?id=403bb2721a497fc1c7b4b44d221e37b110d821bd
Submitter: Jenkins
Branch: master

commit 403bb2721a497fc1c7b4b44d221e37b110d821bd
Author: venkatamahesh <email address hidden>
Date: Tue Sep 20 11:10:59 2016 +0530

    Fix the python3.4 TypeError

    Python3.4 throwing TypeError and in this patch it
    is fixed

    Co-Authored-By: David Purcell <email address hidden>
    Change-Id: I5cbc54142ba2fd1885879c2e401ba84095becc1a
    Closes-Bug: #1625219

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/murano 3.1.0 release.