Fix site_utils reference to utils.

base_utils is the import we are using and where TEE_TO_LOGS exists.
s/utils/base_utils/.

Fix a bug where we reference hosts without ensuring that it is defined.
This happened when testing the above fix.

TEST=./autoserv -m scottz-mario2.cros -c  ../client/site_tests/network_Ping/control
BUG=chromium-os:28079

Change-Id: Ic57b96783f143053bfcf7642d867d25734fb9975
Reviewed-on: https://gerrit.chromium.org/gerrit/18535
Reviewed-by: Chris Masone <cmasone@chromium.org>
Commit-Ready: Scott Zawalski <scottz@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: Scott Zawalski <scottz@chromium.org>
diff --git a/client/common_lib/site_utils.py b/client/common_lib/site_utils.py
index ec53150..c8291a4 100644
--- a/client/common_lib/site_utils.py
+++ b/client/common_lib/site_utils.py
@@ -28,5 +28,5 @@
         args.append('-c%d' % tries)
     return base_utils.run('ping', args=args,
                           ignore_status=True, timeout=timeout,
-                          stdout_tee=utils.TEE_TO_LOGS,
-                          stderr_tee=utils.TEE_TO_LOGS).exit_status
+                          stdout_tee=base_utils.TEE_TO_LOGS,
+                          stderr_tee=base_utils.TEE_TO_LOGS).exit_status