autotest: Migrates network_WiFi_Roaming/000ChannelHopBSS to new method.

BUG=chromium:256895
TEST=autotest

Change-Id: Ic27ee65f39f7eebe4f3f41286b3cc7ccfb0967fc
Reviewed-on: https://gerrit.chromium.org/gerrit/62237
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Wade Guthrie <wdg@chromium.org>
Reviewed-by: Wade Guthrie <wdg@chromium.org>
Tested-by: Wade Guthrie <wdg@chromium.org>
3 files changed