Fix ONAP SDK tests execution using Python 3.7

CentOS build node has not Python3.7 and Python 3.9 is not executed properly

Issue-ID: INT-2219
Signed-off-by: Michal Jagiello <michal.jagiello@t-mobile.pl>
Change-Id: I6fd062e95038a0fdd20ac764fa375c0b7d516428
diff --git a/jjb/integration/integration-python-onapsdk.yaml b/jjb/integration/integration-python-onapsdk.yaml
index d67ca53..7fff52d 100644
--- a/jjb/integration/integration-python-onapsdk.yaml
+++ b/jjb/integration/integration-python-onapsdk.yaml
@@ -4,6 +4,7 @@
     project: integration/python-onapsdk
     project-name: integration-python-onapsdk
     python-version: python3
+    build-node: ubuntu1804-docker-8c-8g
     jobs:
       - integration-linters
     stream: