autotest: Add WEP support for WpaCliProxy While here, add support for spaces in WPA passphrases. TEST=wifi_checkWPA2 and wifi_checkWEP104 both pass on WpaCliProxy and XmlrpcProxy hosts. BUG=chromium:302855 Change-Id: I5b75ebcc4bd990de9512cbb60173fc47dd3f3752 Reviewed-on: https://chromium-review.googlesource.com/171808 Reviewed-by: Christopher Wiley <wiley@chromium.org> Tested-by: Christopher Wiley <wiley@chromium.org> Commit-Queue: Christopher Wiley <wiley@chromium.org>