autotest: WiFi: Add WPA punctuation passphrase test

Try passphrase with all ASCII punctuation characters

BUG=chromium-os:34464
TEST=Run test.

Change-Id: I4dd2c9dffd34b16b0f756442ddcbce25c7ebce0f
Reviewed-on: https://gerrit.chromium.org/gerrit/33430
Commit-Ready: Paul Stewart <pstew@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
1 file changed