Revert of Enable strict coverage for step module

Revert of Enable strict coverage for step module (patchset #3 id:40001 of https://codereview.chromium.org/2806363004/ )

Reason for revert:
Fails downstream, e.g. build:

Exception: While generating results for 'swarming:tests/results_merger_unittest': TypeError: 'NoneType' object is not callable

Looks like it's picking up unrelated swarming tests...

Original issue's description:
> Enable strict coverage for step module
> 
> BUG=chromium:693058
> 
> Review-Url: https://codereview.chromium.org/2806363004
> Committed: https://github.com/luci/recipes-py/commit/3bd327959845d8cb93d1987b3da790a20384a1e1

TBR=iannucci@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:693058
Review-Url: https://codereview.chromium.org/2814873002
Committed: https://github.com/luci/recipes-py/commit/939068138596e0259bd19be9e40c1ab17f55b3d6

[Paweł Hajdan Jr., 2017-04-11 20:38:41]

The CQ bit was checked by phajdan.jr@chromium.org

[Paweł Hajdan Jr., 2017-04-11 20:38:42]

Created Revert of Enable strict coverage for step module

[commit-bot: I haz the power, 2017-04-11 20:38:49]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-11 20:38:54]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491943121952820, "parent_rev":
"3bd327959845d8cb93d1987b3da790a20384a1e1", "commit_rev":
"939068138596e0259bd19be9e40c1ab17f55b3d6"}

[commit-bot: I haz the power, 2017-04-11 20:39:04]

Description was changed from

==========
Revert of Enable strict coverage for step module (patchset #3 id:40001 of
https://codereview.chromium.org/2806363004/ )

Reason for revert:
Fails downstream, e.g. build:

Exception: While generating results for
'swarming:tests/results_merger_unittest': TypeError: 'NoneType' object is not
callable

Looks like it's picking up unrelated swarming tests...

Original issue's description:
> Enable strict coverage for step module
> 
> BUG=chromium:693058
> 
> Review-Url: https://codereview.chromium.org/2806363004
> Committed:
https://github.com/luci/recipes-py/commit/3bd327959845d8cb93d1987b3da790a2038...

TBR=iannucci@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:693058
==========

to

==========
Revert of Enable strict coverage for step module (patchset #3 id:40001 of
https://codereview.chromium.org/2806363004/ )

Reason for revert:
Fails downstream, e.g. build:

Exception: While generating results for
'swarming:tests/results_merger_unittest': TypeError: 'NoneType' object is not
callable

Looks like it's picking up unrelated swarming tests...

Original issue's description:
> Enable strict coverage for step module
> 
> BUG=chromium:693058
> 
> Review-Url: https://codereview.chromium.org/2806363004
> Committed:
https://github.com/luci/recipes-py/commit/3bd327959845d8cb93d1987b3da790a2038...

TBR=iannucci@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:693058

Review-Url: https://codereview.chromium.org/2814873002
Committed:
https://github.com/luci/recipes-py/commit/939068138596e0259bd19be9e40c1ab17f5...
==========

[commit-bot: I haz the power, 2017-04-11 20:39:05]

Committed patchset #1 (id:1) as
https://github.com/luci/recipes-py/commit/939068138596e0259bd19be9e40c1ab17f5...