Add volume for Artifactory access server data

Since some version Artifactory requires writeble data directory
for access server.

Change-Id: Ib29ecd7b731055dc5fff0062e21b93866d7bb2f4
diff --git a/docker/swarm/stack/artifactory.yml b/docker/swarm/stack/artifactory.yml
index caab0ee..4e54a0c 100644
--- a/docker/swarm/stack/artifactory.yml
+++ b/docker/swarm/stack/artifactory.yml
@@ -22,3 +22,4 @@
                 - /srv/volumes/artifactory/etc:/var/opt/jfrog/artifactory/etc
                 - /srv/volumes/artifactory/logs:/var/opt/jfrog/artifactory/logs
                 - /srv/volumes/artifactory/keys:/var/opt/jfrog/artifactory/access/etc/keys
+                - /srv/volumes/artifactory/access-data:/var/opt/jfrog/artifactory/access/data