* Replace map() with list-comprehension to get a list on Python 3.
* Unicode dance: encode text to UTF-8 for MD5, decode Base32 from
ASCII to get text.
* tox.ini: test_designate_driver and test_datastore_versions to
Python 3.4
Partially implements: blueprint trove-python3
Change-Id: I1aa5387908b3f108487ed731cee5f7d9bbfd7d69