add component_ut in assign-test and target-test stage.

Add one template_test python file to get test case

components/esp_netif/test_apps/component_ut_test.py

@@ -0,0 +1,15 @@
+from __future__ import print_function
+
+import ttfw_idf
+
+
+@ttfw_idf.idf_component_unit_test(env_tag='COMPONENT_UT_GENERIC')
+def test_component_ut_esp_netif(env, extra_data):
+    dut = env.get_dut('esp_netif', 'components/esp_netif/test_app')
+    dut.start_app()
+    stdout = dut.expect('Tests finished', full_stdout=True)
+    ttfw_idf.ComponentUTResult.parse_result(stdout)
+
+
+if __name__ == '__main__':
+    test_component_ut_esp_netif()