[LCM][Task idempotency] Task "top-role-mongo" is not idempotent

[Sergey Novikov]

Steps to reproduce:
 1. deploy env with 3 controllers + 1 compute with Ceilometer
 2. Rerun task "top-role-mongo" against non-primary controller node

 # Run task via fuel CLI client
 >fuel node --node-id <controller_id> --tasks top-role-mongo
 #or the direct run of corresponding puppet manifest on controller node
 >puppet apply --noop /etc/puppet/modules/openstack_tasks/examples/roles/mongo.pp

Expected results: No resource changes
Actual result: The following resources were changed
    - Mongodb_user[User **** on db ****]
    - Mongodb_user[User admin on db admin]
Reproducibility:
 100%
Description of the environment:
env was built from ISO MOS 9.0 #448
Additional information:
puppet's output: http://paste.openstack.org/show/508757/

issue is caught by https://product-ci.infra.mirantis.net/job/9.0.system_test.ubuntu.idempotency/43/testReport/(root)/idempotency_3_ctrl_3_cmp_ceph_sahara/idempotency_3_ctrl_3_cmp_ceph_sahara/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/326977

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/327026

[Alexey Shtokolov (ashtokolov)]

@Bartosz @Maciej guys, it's a bug in your feature and you had 3 months to fix it.
Please stop moving bugs right before HCF

[OpenStack Infra (hudson-openstack)]

Change abandoned by Fuel DevOps Robot (<email address hidden>) on branch: master
Review: https://review.openstack.org/327026
Reason: This review is > 4 weeks without comment and currently blocked by a core reviewer with a -2. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and contacting the reviewer with the -2 on this review to ensure you address their concerns.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Andreas Jaeger (<email address hidden>) on branch: master
Review: https://review.opendev.org/326977
Reason: This repo is retired now, no further work will get merged.