Adjust OWNERS for //testing.

Adjust OWNERS for //testing.

We used to have a wildcard OWNERS entry for //testing, and so
some of the sub-directories had "set noparent" directives.

The wildcard is now gone, so this CL removes the "set noparent"
and updates comments to be a bit clearer.

R=phajdan.jr@chromium.org
BUG=

Committed: https://crrev.com/f2a7b6dee72d611cb9abac487ed24cf70f3045fc
Cr-Commit-Position: refs/heads/master@{#358742}

[Paweł Hajdan Jr., 2015-11-09 10:44:27]

LGTM

[Dirk Pranke, 2015-11-09 19:42:44]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-11-09 19:42:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1415633004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1415633004/1

[commit-bot: I haz the power, 2015-11-09 20:47:20]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-09 20:47:21]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Dirk Pranke, 2015-11-09 20:51:22]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-11-09 20:52:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1415633004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1415633004/1

[commit-bot: I haz the power, 2015-11-09 21:55:34]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-09 21:55:35]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Dirk Pranke, 2015-11-10 00:42:54]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-11-10 00:44:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1415633004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1415633004/1

[commit-bot: I haz the power, 2015-11-10 01:56:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-10 01:57:53]

Patchset 1 (id:??) landed as
https://crrev.com/f2a7b6dee72d611cb9abac487ed24cf70f3045fc
Cr-Commit-Position: refs/heads/master@{#358742}