Fix pytest args/config, with a recent pytest the previous args/config didn't work anymore.

Author: poletti-marco

extras/scripts/postsubmit-helper.sh

@@ -252,7 +252,7 @@ then
     cd tests
     run_make
 
-    python3 -m pytest -n auto -r a "$SOURCES_PATH"/tests
+    python3 -m pytest -n auto -r a
     cd ..
 
     make install

tests/CMakeLists.txt

@@ -155,6 +155,7 @@ file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/pytest.ini"
      CONTENT "
 [pytest]
 testpaths = \"${CMAKE_CURRENT_SOURCE_DIR}\"
+pythonpath = \"${CMAKE_CURRENT_SOURCE_DIR}\"
 addopts = -r a
 timeout = 300
 ")