Allow to specify custom json in test_devops_portal

Change-Id: I2a74807d1b418a617446d376a53bfe23febe1450
diff --git a/jenkins/client/job/test_devops_portal.yml b/jenkins/client/job/test_devops_portal.yml
index aae2d67..41be263 100644
--- a/jenkins/client/job/test_devops_portal.yml
+++ b/jenkins/client/job/test_devops_portal.yml
@@ -38,6 +38,9 @@
             CREDENTIALS_ID:
               type: string
               default: "gerrit"
+            JSON_CONFIG:
+              type: string
+              default: '{"services": {"elasticsearch": {"endpoint": "http://elasticsearch:9200"}}}'
             NODE_IMAGE:
               type: string
               default: "docker-sandbox.sandbox.mirantis.net/ikharin/ci/node-firefox:6.10"