Update .gitignore pattern for "results" files.

The previous pattern was ignoring some recently added files:
    site_utils/bootperf-bin/resultsdir.py
    site_utils/bootperf-bin/resultset.py

This update the pattern not to ignore those files.  Hopefully, it
will continue to ignore other files that it should.

BUG=None
TEST=git status with changes the files that shouldn't be ignored

Change-Id: Ia48fc562eed777a292001835408a26f1cfa74f2e
Reviewed-on: https://chromium-review.googlesource.com/176156
Commit-Queue: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Fang Deng <fdeng@chromium.org>
diff --git a/.gitignore b/.gitignore
index ebe65bf..94a7c0c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,7 +38,8 @@
 client/tmp
 client/tests/kvm/*.cfg
 logs/*
-results*
+results-*
+results/*
 server/tmp
 tko/parsers/test/site_scenarios
 ExternalSource