Add 5-second delay to network_WiFiPerf.061Perf24HT40_AES test

BUG=chrome-os-partner:12140
TEST=Manual (run test)

Change-Id: I20617f1bc9ff8e439d76d39d28b0e129aa1d606f
Reviewed-on: https://gerrit.chromium.org/gerrit/29687
Reviewed-by: Gary Morain <gmorain@chromium.org>
Commit-Ready: Tan Gao <tgao@chromium.org>
Tested-by: Tan Gao <tgao@chromium.org>
1 file changed