cbbackupmgr fails to backup cluster with eventing service for user with 'Data Backup & Restore' role

1. Create a 1-node cluster with all services initialized
2. Create default bucket and load it
3. Create a RBAC user with role 'Data Backup & Restore' on default
4. Try to backup the cluster using cbbackupmgr - error:

018-10-12T23:02:32.413+00:00 [INFO][FDB] Forestdb closed database file /tmp/entbackup/backup/2018-10-12T23_02_29.766904304Z/default-500bc771ef6468e83e92b496f6f6e56d/data/shard_0.fdb
2018-10-12T23:02:32.414+00:00 (Plan) Data transfer completed after 2.117670137s
2018-10-12T23:02:32.415+00:00 (Plan) Transfering Eventing metadata
2018-10-12T23:02:32.416+00:00 (Rest) GET http://10.111.170.101:8091/pools/default/nodeServices 200
2018-10-12T23:02:32.418+00:00 (Rest) GET http://10.111.170.101:8096/api/v1/export 403
2018-10-12T23:02:32.418+00:00 ERRO: : – plan.(*events).execute() at events.go:43
2018-10-12T23:02:32.418+00:00 (Plan) Transfer plan failed due to error :
2018-10-12T23:02:32.418+00:00 (Cmd) Error backing up cluster: :

Looks like 'Data backup & Restore role' is not given access to eventing service as it is returning 403 - backup works fine only if we give the user full admin access - even if we give all other roles except full admin it does not work

server logs: https://s3.amazonaws.com/bugdb/jira/oct12/collectinfo-2018-10-12T232013-ns_1%40127.0.0.1.zip

attaching logs and screenshots