Android O MR1 Preview 2 (OPP6.171019.012)
Update to Checkstyle 8.1

Moving from Checkstyle 7.4 to 8.1.

As part of the move, we had to move SuppressionCommentFilter rules
to treewalker checks (Checkstyle breaking change).

Release notes:
http://checkstyle.sourceforge.net/releasenotes.html

Jar taken from:
https://android-build.googleplex.com/builds/submitted/4266895/checkstyle/latest

Change-Id: Ieef0c309be2e417aff3c7af6d6d9321cd82b1c1a
Fixes: 64588172
Test: ran checkstyle.py on a few files
3 files changed