Remove run_remote_tests references.

run_remote_tests.sh is about to be removed from ChromeOS.  This
CL removes all references to run_remote_tests from toolchain-utils.
It also updates unittests to make sure they work with recent
changes.

BUG=crbug:498778
TEST=Verifed results_cache_unittest (and all the other unittests)
works with changes.

Change-Id: Ic9413bf77a1679e1267b81b182fa7f64da2629b5
Reviewed-on: https://chrome-internal-review.googlesource.com/216884
Reviewed-by: David Sharp <dhsharp@google.com>
Commit-Queue: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
diff --git a/remote_test.py b/remote_test.py
index 37ac2b7..f3ff3fc 100755
--- a/remote_test.py
+++ b/remote_test.py
@@ -2,7 +2,7 @@
 #
 # Copyright 2010 Google Inc. All Rights Reserved.
 
-"""Script to wrap run_remote_tests.sh script.
+"""Script to wrap test_that script.
 
 This script can login to the chromeos machine using the test private key.
 """