[autotest] Make one less RPC call in CrosHost.lookup_job_repo_url().

In CrosHost.lookup_job_repo_url(), the method made two consecutive,
identical calls to AFE.get_hosts().  This change eliminates the
redundant call.

BUG=None
TEST=None

Change-Id: Ia38b40e0af928a258fe0f0c86331c25fcc391cd7
Reviewed-on: https://chromium-review.googlesource.com/294734
Commit-Queue: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Paul Hobbs <phobbs@google.com>
Reviewed-by: Dan Shi <dshi@chromium.org>
1 file changed