Move tether_utils into utils folder

This is no-op refactoring to move tether_utils into
a dedicated folder for utilities.

Test: m connectivity_multi_devices_snippet && \
      atest CtsConnectivityMultiDevicesTestCases:ConnectivityMultiDevicesTest
Bug: 345110845
Change-Id: I1df277570d3295e9ac5307f92e0a338481e3f732
diff --git a/tests/cts/multidevices/Android.bp b/tests/cts/multidevices/Android.bp
index 5f9b3ef..1d30d68 100644
--- a/tests/cts/multidevices/Android.bp
+++ b/tests/cts/multidevices/Android.bp
@@ -22,7 +22,7 @@
     main: "connectivity_multi_devices_test.py",
     srcs: [
         "connectivity_multi_devices_test.py",
-        "tether_utils.py",
+        "utils/*.py",
     ],
     libs: [
         "mobly",