autotest: Migrate network_WiFiSecMat/019CheckWPA_1x_AES

On the way, complete adding support for negative assertions to SimpleConnect.
We can now assert that an attempt should fail rather than succeed.

TEST=This is a test.  It passes.
BUG=chromium:256351
Change-Id: Ibc864ced7006175dcb24ac9b90bcc74f90c51cb9
Reviewed-on: https://gerrit.chromium.org/gerrit/60790
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
6 files changed