[SWARM][8.0] separate_keystone_service_add_delete_node: ostf failures after adding keystone node

[Vladimir Jigulin]

Steps to reproduce:
Use 'separate_keystone_service_add_delete_node' from fuel-qa with steps:
1. Create cluster
2. Add 3 nodes with controller role
3. Add 3 nodes with keystone role
4. Add 1 compute and cinder
5. Verify networks
6. Deploy the cluster
7. Verify networks
8. Run OSTF
9. Revert snapshot separate_keystone_service
10. Add one keystone node and re-deploy cluster
11. Run network verification
12. Run OSTF <<=

Expected results: OSTF passed

Actual result: Error Message
Failed 5 OSTF tests; should fail 0 tests. Names of failed tests:
  - Check network connectivity from instance via floating IP (failure) Subnet can not be deleted Please refer to OpenStack logs for more details.
  - Create security group (failure) Failed to create rule in security group. Please refer to OpenStack logs for more details.
  - Launch instance with file injection (failure) Creating instance using the new security group has failed. Please refer to OpenStack logs for more details.
  - Launch instance, create snapshot, launch instance from snapshot (error)
  - Create user and authenticate with it. (failure) User can not be created. Please refer to OpenStack logs for more details

Some logs:
[root@nailgun ~]# grep ERROR /var/log/docker-logs/ostf.log -B3 -A26
http://termbin.com/xe9l

Snapshot: https://drive.google.com/file/d/0Bw7ZahkM7_sJMFNLNXlvQ2VSUVU/view?usp=sharing

Reproducibility: 99%