This commit removes .testr.conf since this repo already has
.stestr.conf. We just need .stestr.conf instead of .testr.conf.
Change-Id: I3bc6d4768f2673adbf22bb8106a5843c1eaaaf72
Following commit does several things:
* changes nose to ostestr
* enables coverage
* adds flake8 for tests
* adds bandit
Bandit note:
Multiple asserts of bandit had to be disabled at this
point because fixing them was not obvious. Several simple
asserts like B110 [try_except_pass] were fixed with
Closes-Bug: #1628740
Change-Id: I640857349008178e8a6f565e31ca2fde26ce8da7