Change gradle testing image to mirrored

gradle image, used by testing was hidden/removed,
and this patch switch tests to mirrored docker image

Related-PROD: PROD-21176

Change-Id: I54324b68409e5480fd2b1aba275f13db41e7306e
diff --git a/jenkins/client/job/test_pipelines.yml b/jenkins/client/job/test_pipelines.yml
index c9a2442..2b0fabe 100644
--- a/jenkins/client/job/test_pipelines.yml
+++ b/jenkins/client/job/test_pipelines.yml
@@ -46,7 +46,7 @@
                 default: "gerrit"
               GRADLE_IMAGE:
                 type: string
-                default: "niaquinto/gradle"
+                default: "docker-dev-local.docker.mirantis.net/mirantis/cicd/niaquinto_gradle"
               GRADLE_CMD:
                 type: string
                 default: "check --info"