tests: call venv module directly

This avoids

ModuleNotFoundError: No module named 'virtualenv.seed.embed.via_app_data'

https://github.com/pypa/virtualenv/issues/1873

Type: fix
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Change-Id: I860cc8c4ad2ba509815c5e7cf02fa5e01ee2ed63
diff --git a/test/Makefile b/test/Makefile
index 2421086..d4d74bb 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -124,7 +124,7 @@
 $(PIP_TOOLS_INSTALL_DONE):
 	@rm -rf $(VENV_PATH)
 	@mkdir -p $(VENV_RUN_DIR)
-	@virtualenv $(VENV_PATH) -p $(PYTHON_INTERP)
+	@$(PYTHON_INTERP) -m venv $(VENV_PATH)
 	# pip version pinning
 	@bash -c "source $(VENV_PATH)/bin/activate && \
 		  $(PYTHON_INTERP) -m pip install pip===$(PIP_VERSION)"