Update validation docker image version

Pomba uses validation 1.3.1 to work with data-router

Change-Id: Ie63889e65b0827ddc8df1ac274d4a1aacebf250a
Issue-ID: INT-943
Signed-off-by: Yang Xu <yang.xu3@huawei.com>
diff --git a/version-manifest/src/main/resources/docker-manifest-staging.csv b/version-manifest/src/main/resources/docker-manifest-staging.csv
index e6d04a6..3e44ec4 100644
--- a/version-manifest/src/main/resources/docker-manifest-staging.csv
+++ b/version-manifest/src/main/resources/docker-manifest-staging.csv
@@ -139,7 +139,7 @@
 onap/tproxy-config,2.1-STAGING-latest
 onap/usecase-ui,1.2.2-STAGING-latest
 onap/usecase-ui-server,1.2.1-STAGING-latest
-onap/validation,1.4-STAGING-latest
+onap/validation,1.3.1
 onap/vfc/catalog,1.2.2-STAGING-latest
 onap/vfc/db,1.2.2-STAGING-latest
 onap/vfc/emsdriver,1.2.1-STAGING-latest