Autotest fails due to missing __init__.py

LegacyVpnTest fails in iot_ent autotest while importing
connectivity_const module from acts.test_utils.net
Python2.7 requires __init__.py to initialize packages

Bug: None
Test: None
Change-Id: Ia74ebdb851193e30e8377160a24944e947794a89
diff --git a/acts/framework/acts/test_utils/net/__init__.py b/acts/framework/acts/test_utils/net/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/acts/framework/acts/test_utils/net/__init__.py