check: allow comments in exclude files

check: allow comments in exclude files

Sometimes it's useful to keep track of why we're excluding a particular
test. Technically, we can include whatever explanation we want in the
exclude file since we just grep for the test names, but properly
supporting comments is a little more robust. This patch makes it so that
the rest of a line after a '#' is ignored.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>