bootperf: Fix bootperf to run again

I was getting this error:

  >>> "server/site_tests/platform_BootPerfServer/control" is an ambiguous pattern.
  Disambiguate by passing one of these patterns instead:
     ^server/site_tests/platform_BootPerfServer/control$
     ^server/site_tests/platform_BootPerfServer/control.perfalerts$

...so I have done so.

BUG=None
TEST=Ran:
  ../platform/crostestutils/bootperf-bin/bootperf --output_dir \
    ~/bootperf das1 2

Change-Id: I8efed4612774af2cd71a545058d712f58c8142d3
Reviewed-on: https://gerrit.chromium.org/gerrit/25022
Tested-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Commit-Ready: Doug Anderson <dianders@chromium.org>
diff --git a/bootperf-bin/bootperf b/bootperf-bin/bootperf
index 340b91a..019f816 100755
--- a/bootperf-bin/bootperf
+++ b/bootperf-bin/bootperf
@@ -43,7 +43,7 @@
 DEFINE_boolean keep_logs "$FLAGS_FALSE" "keep autotest results" k
 
 RUN_TEST="run_remote_tests.sh"
-TEST=server/site_tests/platform_BootPerfServer/control
+TEST='server/site_tests/platform_BootPerfServer/control$'
 TMP_RESULTS="$(mktemp -d /tmp/bootperf.XXXXXX)"
 RESULTS_DIR=platform_BootPerfServer/platform_BootPerfServer/results
 RESULTS_KEYVAL=$RESULTS_DIR/keyval