[autotest] Fix AFE when adding a host.

The site_host_create class construct_without_parse method wasn't updated
to create a class attributes serials which caused an issue when creating
the host in execute().

BUG=chromium:576844
TEST=locally on moblab, add host from AFE works with change patched in.

Change-Id: I2f761e3b8c905f246f14beda50079a9ae0f20583
Reviewed-on: https://chromium-review.googlesource.com/321791
Commit-Ready: Kevin Cheng <kevcheng@chromium.org>
Tested-by: Kevin Cheng <kevcheng@chromium.org>
Reviewed-by: Dan Shi <dshi@chromium.org>
1 file changed