Fixe for issue #266, #265 and refactoring

[akharit]

---

This checklist is used to make sure that common guidelines for a pull request are followed.

Description of the change

Fixe for issue #265 and #265. Also some refactoring for multiprocessor acl change code.

General Guidelines

• The PR has modified HISTORY.rst with an appropriate description of the change and a version increment.
  Will be done when merge to master later and making a new release
• The PR has supporting test coverage that confirm the expected behavior and protects against regressions, including necessary recordings.
• Links to associated bugs, if any, are in the description.

[coveralls]

Coverage increased (+0.05%) to 86.65% when pulling 62fa2ee on akharit-bugfixes into eb585b4 on dev.

[coveralls]

Coverage increased (+0.05%) to 86.65% when pulling 62fa2ee on akharit-bugfixes into eb585b4 on dev.

[coveralls]

Coverage increased (+0.05%) to 86.65% when pulling c1ca10d on akharit-bugfixes into eb585b4 on dev.

[lmazuel]

LGTM to me, thanks for asking me a reviewer!
To double-check everything works:

• Your sdist must contains azure/__init__.py (with the pkgutil syntax)
• Your wheel must NOT contain azure/__init__.py
• Install the wheel on Python 3 must NOT install azure-nspkg

[lmazuel]

You're not required to do that if you don't import "azure.common" (but doesn't harm)

[lmazuel]

Jsut realized I read too fast the first time, should be "azure-nspkg"