Make generated SSIDs in tests unique

This allows us to strongly assume that all generated SSIDs are unique.

BUG=chromium:365813
TEST=wifi_matfunc passes with this test.  SSIDs are now uniquified by
log inspection.

Change-Id: Ie8e5beae1adb466001713f6fb1b4abe939e49847
Reviewed-on: https://chromium-review.googlesource.com/196543
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
2 files changed