Revert of path: Add tracking of volatile paths.

Revert of path: Add tracking of volatile paths. (patchset #3 id:40001 of https://codereview.chromium.org/2808713003/ )

Reason for revert:
different approach, no longer needed, reduce extra complexity.

Original issue's description:
> path: Add tracking of volatile paths.
> 
> Allow a caller to express to the recipe engine that named paths are
> volatile. This can, in turn, be used by recipes to determine if they should
> care about residual files in between recipe executions within that path.
> 
> BUG=chromium:708616
> TEST=expectations
> 
> Review-Url: https://codereview.chromium.org/2808713003
> Committed: https://github.com/luci/recipes-py/commit/f31d525eef33613aa537e8ed954e7dfbf1cae8b2

TBR=nodir@chromium.org,iannucci@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:708616
Review-Url: https://codereview.chromium.org/2811143005
Committed: https://github.com/luci/recipes-py/commit/addc0640c912a43c6ea02dbfda992407cc9957ff

[dnj, 2017-04-12 14:31:53]

The CQ bit was checked by dnj@chromium.org

[dnj, 2017-04-12 14:31:53]

Created Revert of path: Add tracking of volatile paths.

[commit-bot: I haz the power, 2017-04-12 14:32:04]

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, 2017-04-12 14:34:59]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1492007513174440, "parent_rev":
"d6ceb66a08508d430a0fbdd5a6a17c09b9633694", "commit_rev":
"addc0640c912a43c6ea02dbfda992407cc9957ff"}

[commit-bot: I haz the power, 2017-04-12 14:35:05]

Description was changed from

==========
Revert of path: Add tracking of volatile paths. (patchset #3 id:40001 of
https://codereview.chromium.org/2808713003/ )

Reason for revert:
different approach, no longer needed, reduce extra complexity.

Original issue's description:
> path: Add tracking of volatile paths.
> 
> Allow a caller to express to the recipe engine that named paths are
> volatile. This can, in turn, be used by recipes to determine if they should
> care about residual files in between recipe executions within that path.
> 
> BUG=chromium:708616
> TEST=expectations
> 
> Review-Url: https://codereview.chromium.org/2808713003
> Committed:
https://github.com/luci/recipes-py/commit/f31d525eef33613aa537e8ed954e7dfbf1c...

TBR=nodir@chromium.org,iannucci@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:708616
==========

to

==========
Revert of path: Add tracking of volatile paths. (patchset #3 id:40001 of
https://codereview.chromium.org/2808713003/ )

Reason for revert:
different approach, no longer needed, reduce extra complexity.

Original issue's description:
> path: Add tracking of volatile paths.
> 
> Allow a caller to express to the recipe engine that named paths are
> volatile. This can, in turn, be used by recipes to determine if they should
> care about residual files in between recipe executions within that path.
> 
> BUG=chromium:708616
> TEST=expectations
> 
> Review-Url: https://codereview.chromium.org/2808713003
> Committed:
https://github.com/luci/recipes-py/commit/f31d525eef33613aa537e8ed954e7dfbf1c...

TBR=nodir@chromium.org,iannucci@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:708616

Review-Url: https://codereview.chromium.org/2811143005
Committed:
https://github.com/luci/recipes-py/commit/addc0640c912a43c6ea02dbfda992407cc9...
==========

[commit-bot: I haz the power, 2017-04-12 14:35:06]

Committed patchset #1 (id:1) as
https://github.com/luci/recipes-py/commit/addc0640c912a43c6ea02dbfda992407cc9...