[autotest] Add back HostInfo get call from a bad revert.

The revert b9d7adf07aec05db6a3f1a8b74f45abd7a87c74a interacted badly
with a few CLs. This one hasn't affected anyone yet, afaict.

BUG=chromium:678430
TEST=None

Change-Id: I7f6df6e86d60660492e138c95482373cac75a6a2
Reviewed-on: https://chromium-review.googlesource.com/462022
Commit-Ready: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
diff --git a/server/hosts/cros_host.py b/server/hosts/cros_host.py
index 3712344..489da49 100644
--- a/server/hosts/cros_host.py
+++ b/server/hosts/cros_host.py
@@ -439,6 +439,7 @@
                         'Failed to parse build name from %s' % image)
             ds = dev_server.ImageServer.resolve(image_name, hostname)
         else:
+            info = self.host_info_store.get()
             job_repo_url = afe_utils.get_host_attribute(
                     self, ds_constants.JOB_REPO_URL)
             if job_repo_url: