ansible: Use osmo-gsm-tester docker image in jenkins job osmo-gsm-tester_virtual

Let's use the osmo-gsm-tester docker image based on the
debian-stretch-jenkins instead of the later directly, since the former
has all osmo-gsm-tester required dependencies.

Change-Id: I256eeed82eef0969d93dc015e043b0417f56f52c

jobs/osmo-gsm-tester-runner.yml

@@ -244,7 +244,7 @@
               -v "$HOME/bin:/build_bin" \
               -v "$HOME/.ssh:/home/build/.ssh:ro" \
               --cap-add=sys_nice \
-              $USER/debian-stretch-jenkins \
+              $USER/osmo-gsm-tester \
               /bin/bash -c 'LANG="en_US.utf8" LC_ALL="en_US.UTF-8" LC_LANG="en_US.UTF-8" PATH="$PWD/osmo-gsm-tester/src:${PATH}" ./osmo-gsm-tester/contrib/jenkins-run.sh'
     publishers:
       - archive:

scripts/osmo-ci-docker-rebuild.sh

@@ -4,4 +4,5 @@ cd "$(dirname "$0")/.."
 . scripts/common.sh
 docker_images_require \
 	"debian-stretch-jenkins" \
-	"debian-buster-erlang"
+	"debian-buster-erlang" \
+	"osmo-gsm-tester"