autotest: Migrate network_WiFiSecMat/120ChangeBSSSecurity

TEST=This is a test.  It passes.
BUG=chromium:256348
Change-Id: I2b0e392d43dbcef28f76e91c0c86c61aae3600de
Reviewed-on: https://gerrit.chromium.org/gerrit/60674
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
3 files changed