net-test: all_tests.py - fix a lint warning

Fixes:
  Forcing safe mode "style".
  ************* File all_tests.py
  C6202: 17: Importing a member of a module [g-importing-member]
  http://go/gpylint-faq#g-importing-member

Bug: 153035880
Test: ran uml net_tests against Android Kernel Common 4.19
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I924e58fd5c5c4ce380c9d40d6cabe8766491313e
Merged-In: I924e58fd5c5c4ce380c9d40d6cabe8766491313e
diff --git a/net/test/all_tests.py b/net/test/all_tests.py
index 83c2770..5f6c583 100755
--- a/net/test/all_tests.py
+++ b/net/test/all_tests.py
@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from importlib import import_module
+import importlib
 import sys
 import unittest
 
@@ -49,7 +49,7 @@
   # First, run InjectTests on all modules, to ensure that any parameterized
   # tests in those modules are injected.
   for name in test_modules:
-    import_module(name)
+    importlib.import_module(name)
     if hasattr(sys.modules[name], 'InjectTests'):
       sys.modules[name].InjectTests()