Revert "Use dev_server to determine the url of the devserver."

Started seeing this on the autotest server:

Traceback (most recent call last):
  File "/usr/local/autotest/server/server_job.py", line 539, in run
    self._execute_code(server_control_file, namespace)
  File "/usr/local/autotest/server/server_job.py", line 1022, in _execute_code
    execfile(code_file, namespace, namespace)
  File "/usr/local/autotest/results/426888-chromeos-test/chromeos-rack8c-host2/
control.srv", line 31, in <module>
    repo_url = dynamic_suite._package_url_pattern() % image_name

This reverts commit dfe7042a31f726cd637530cfc28ecaaec08256ba.

Change-Id: Icf560ac11f7f5567b7dbe4e32a13584ccdda06c7
Reviewed-on: https://gerrit.chromium.org/gerrit/28724
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
6 files changed