Mark par_test as not unit tests

They seem to be used as Soong validation. They are not implemented against the python
unit tests framework, so we can execute them as such in CI automatically.

Change-Id: I8fe662d5d3399d60c8a05acc79b4dd51b5d138a6
Test: presubmit
Bug: 183730987

python/tests/Android.bp

@@ -23,7 +23,10 @@ python_test_host {
         "par_test.py",
         "testpkg/par_test.py",
     ],
-
+    // Is not implemented as a python unittest
+    test_options: {
+        unit_test: false,
+    },
     version: {
         py2: {
             enabled: true,
@@ -43,7 +46,10 @@ python_test_host {
         "par_test.py",
         "testpkg/par_test.py",
     ],
-
+    // Is not implemented as a python unittest
+    test_options: {
+        unit_test: false,
+    },
     version: {
         py3: {
             embedded_launcher: true,