Investigate issues with configlet lint in Travis-CI builds

[cmccandless]

As observed in #1690 (comment), configlet lint may not be catching everything it is supposed to in our Travis builds (latest build as of this writing passed without issue).

It is unlikely that the issue is with configlet itself, as that same tool was used to find the very violations that CI builds missed, so there is probably an issue with how the builds are configured.

[cmccandless]

@junming403 Can you confirm what version of configlet you used to lint in #1690?

[junming403]

There is a script fetch-configlet in code base.

[cmccandless]

After further investigation: I have determined there is no issue with configlet lint. The issues found in #1690 were changes made by config fmt, and are not called out by configlet lint.

@junming403 can you please confirm that you did run configlet fmt . in #1690?