Change in vdsm[master]: tests: Mark slow and stress tests using pytest.mark

[Code Review]

From Dan Kenigsberg :

Dan Kenigsberg has submitted this change and it was merged. ( https://gerrit.ovirt.org/78633 )

Change subject: tests: Mark slow and stress tests using pytest.mark
......................................................................

tests: Mark slow and stress tests using pytest.mark

Replace @slowtest and @stresstest with pytest.marks.

When running from tox, slow and stress tests do not run but are not
skipped; instead these they are reported as "deselected":

314 passed, 40 skipped, 91 deselected, 29 warnings in 22.40 seconds

When running directly, for example when running a single module tests,
all tests run by default:

$ pytest storage/asyncevent_test.py
    ====================================================================================
    test session starts
    =====================================================================================
    platform linux -- Python 3.5.3, pytest-3.1.0, py-1.4.33, pluggy-0.4.0
    rootdir: /home/nsoffer/src/vdsm/tests, inifile:
    collected 67 items

storage/asyncevent_test.py ...................................................................

=================================================================================
    67 passed in 8.38 seconds
    ==================================================================================

To run only fast tests, disable slow or stress tests:

$ pytest -m "not (slow or stress)" storage/asyncevent_test.py
    ====================================================================================
    test session starts
    =====================================================================================
    platform linux -- Python 3.5.3, pytest-3.1.0, py-1.4.33, pluggy-0.4.0
    rootdir: /home/nsoffer/src/vdsm/tests, inifile:
    collected 67 items

storage/asyncevent_test.py ................................

====================================================================================
    35 tests deselected
    =====================================================================================
    ==========================================================================
    32 passed, 35 deselected in 0.92 seconds
    ==========================================================================

Change-Id: I57eac4ad7eeadc4f95000d8bedc1651ecb8bcf60
Signed-off-by: Nir Soffer 
---
M tests/storage/asyncevent_test.py
M tests/storage/asyncutils_test.py
M tests/storage/blockvolume_test.py
M tests/storage/check_test.py
M tests/storage/mount_test.py
M tests/storage/qcow2_test.py
M tests/storage/resourcemanager_test.py
M tests/storage/rwlock_test.py
M tests/storage/xlease_test.py
M tox.ini
10 files changed, 57 insertions(+), 48 deletions(-)

Approvals:
  Adam Litke: Looks good to me, approved
  Nir Soffer: Verified
  Jenkins CI: Passed CI tests
  Irit Goihman: Looks good to me, but someone else must approve