autotest: Install router credentials at configuration time

This removes one very unintuitive step from our router configuration
process.

TEST=network_WiFi_SimpleConnect 802.1x tests continue to pass
BUG=None

Change-Id: I8595c1b0c975843e0139e11a4981560746877352
Reviewed-on: https://chromium-review.googlesource.com/178860
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
3 files changed