Migrate test_utils from acts to acts_contrib

This change will allow the ACTS framework to be packaged independently
of its test_utils. This facilitates the usage of ACTS within test suites
outside of tools/test/connectivity.

Re-submission of ag/13029169.
This reverts commit a4913cd4087bb09bf192de6ef819657aa6e082bd.

Reason for revert: Submit once references in acts_power are fixed.

Change-Id: I2d60f8ccaf936a80820a7b4387c23bbce1293dcf
diff --git a/acts_tests/tests/google/fuchsia/backlight/BacklightTest.py b/acts_tests/tests/google/fuchsia/backlight/BacklightTest.py
index 9d15781..9cc6c0c 100644
--- a/acts_tests/tests/google/fuchsia/backlight/BacklightTest.py
+++ b/acts_tests/tests/google/fuchsia/backlight/BacklightTest.py
@@ -21,7 +21,7 @@
 from acts import asserts, signals
 from acts.base_test import BaseTestClass
 from acts.libs.proc.job import Error
-from acts.test_utils.tel.tel_test_utils import setup_droid_properties
+from acts_contrib.test_utils.tel.tel_test_utils import setup_droid_properties
 
 BRIGHTNESS_CHANGE_SLEEP_TIME_SECONDS = 2