Clean up error message in schema-based policy validation

Clean up error message in schema-based policy validation

Make the error message a little bit more readable.

Old example:
"Dropping policy Undeclared for aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa because it's not valid: The schema is invalid. at "

Example after the change:
"Dropping policy Undeclared of component aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa due to error at root: The schema is invalid."

BUG=none
TEST=none

Committed: https://crrev.com/4372393deb7e34ba940a3687910df7f7ff128e53
Cr-Commit-Position: refs/heads/master@{#435921}

[emaxx, 2016-12-01 22:16:57]

The CQ bit was checked by emaxx@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-12-01 22:17:23]

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

[emaxx, 2016-12-01 22:20:11]

Description was changed from

==========
Clean up error message in schema-based policy validation

Make the error message a little bit more readable.

BUG=none
TEST=none
==========

to

==========
Clean up error message in schema-based policy validation

Make the error message a little bit more readable.

Old example:
"Dropping policy Undeclared for aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa because it's
not valid: The schema is invalid. at "

Example after the change:
"Dropping policy Undeclared of component aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa due to
error at root: The schema is invalid."

BUG=none
TEST=none
==========

[commit-bot: I haz the power, 2016-12-01 23:02:55]

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

[commit-bot: I haz the power, 2016-12-01 23:02:56]

Dry run: This issue passed the CQ dry run.

[emaxx, 2016-12-02 00:14:16]

emaxx@chromium.org changed reviewers:
+ pastarmovj@chromium.org

[emaxx, 2016-12-02 00:14:16]

Julian, May I ask you to review this small cleanup CL?
It's pretty low-priority.

[pastarmovj, 2016-12-02 08:01:28]

lgtm

[emaxx, 2016-12-02 12:19:46]

The CQ bit was checked by emaxx@chromium.org

[commit-bot: I haz the power, 2016-12-02 12:19:58]

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, 2016-12-02 12:23:56]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480681186269430, "parent_rev":
"f0949e294096bf6544e8ee0596bcb812519857ba", "commit_rev":
"f1c8be1bfb7fcc870a97ce57c50dc65f0ddd34b5"}

[commit-bot: I haz the power, 2016-12-02 12:24:23]

Description was changed from

==========
Clean up error message in schema-based policy validation

Make the error message a little bit more readable.

Old example:
"Dropping policy Undeclared for aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa because it's
not valid: The schema is invalid. at "

Example after the change:
"Dropping policy Undeclared of component aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa due to
error at root: The schema is invalid."

BUG=none
TEST=none
==========

to

==========
Clean up error message in schema-based policy validation

Make the error message a little bit more readable.

Old example:
"Dropping policy Undeclared for aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa because it's
not valid: The schema is invalid. at "

Example after the change:
"Dropping policy Undeclared of component aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa due to
error at root: The schema is invalid."

BUG=none
TEST=none
==========

[commit-bot: I haz the power, 2016-12-02 12:24:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-02 12:26:31]

Description was changed from

==========
Clean up error message in schema-based policy validation

Make the error message a little bit more readable.

Old example:
"Dropping policy Undeclared for aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa because it's
not valid: The schema is invalid. at "

Example after the change:
"Dropping policy Undeclared of component aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa due to
error at root: The schema is invalid."

BUG=none
TEST=none
==========

to

==========
Clean up error message in schema-based policy validation

Make the error message a little bit more readable.

Old example:
"Dropping policy Undeclared for aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa because it's
not valid: The schema is invalid. at "

Example after the change:
"Dropping policy Undeclared of component aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa due to
error at root: The schema is invalid."

BUG=none
TEST=none

Committed: https://crrev.com/4372393deb7e34ba940a3687910df7f7ff128e53
Cr-Commit-Position: refs/heads/master@{#435921}
==========

[commit-bot: I haz the power, 2016-12-02 12:26:32]

Patchset 1 (id:??) landed as
https://crrev.com/4372393deb7e34ba940a3687910df7f7ff128e53
Cr-Commit-Position: refs/heads/master@{#435921}