Change in vdsm[master]: tests: Run storage tests using tox and pytest

[Code Review]

From Dan Kenigsberg :

Dan Kenigsberg has submitted this change and it was merged. ( https://gerrit.ovirt.org/78627 )

Change subject: tests: Run storage tests using tox and pytest
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tests: Run storage tests using tox and pytest

Storage tests are running now using tox storage-py27, storage-py35, and
storage-py36 (for Fedora rawhide) envs, using pytest instead of nose.

The storage modules were removed completely from tests/Makefile. To
blacklist modules not compatible with python 3 we use pytest
--ignore=path option.

See tests/README for more info on running the new tests.

Change-Id: I783ac7db1aad63d1e38d2b654c668ce05e638c9c
Signed-off-by: Nir Soffer 
---
M Makefile.am
M tests/Makefile.am
M tests/README
M tox.ini
4 files changed, 137 insertions(+), 55 deletions(-)

Approvals:
  Adam Litke: Looks good to me, approved
  Nir Soffer: Verified
  Jenkins CI: Passed CI tests