Distributed Cloud: Role creation and deletion from System Controller not sync with Subcloud

Brief Description
-----------------
In Distributed Cloud System, Create new role on System Controller. The new role shows up in all subclouds (manage and unmanage). Delete newly created role, the role would not be deleted from on all subclouds. period

Severity
--------
Critical

Steps to Reproduce
------------------
create/delete new role from System Controller.

Expected Behavior
------------------
role is created or deleted accordingly

Actual Behavior
----------------
when create, new role show up on unmanage subcloud;
when delete, role still show on all subcloud (manage and unmanage)

Reproducibility
---------------
Reproducible

System Configuration
--------------------
Multi-node system

Branch/Pull Time/Commit
-----------------------
StarlingX_18.10 release branch as of 2018-10-08_01-52-01

Timestamp/Logs
--------------
On System Controller:

[wrsroot@controller-0 ~(keystone_admin)]$ openstack role create now_test-role
+-----------+----------------------------------+
| Field | Value |
+-----------+----------------------------------+
| domain_id | None |
| id | f57afa620deb40f49da54cea32921e75 |
| name | now_test-role |
+-----------+----------------------------------+
[wrsroot@controller-0 ~(keystone_admin)]$ openstack role list
+----------------------------------+------------------+
| ID | Name |
+----------------------------------+------------------+
| e675f74b138f46f9b22ad576b56291ea | admin |
| 9fe2ff9ee4384b1894a90878d3e92bab | _member_ |
| 0b2862c1f04b4b2dab5ab0c0ec683697 | heat_stack_user |
| 7c3618a17880420e8190713c47eb1edb | heat_stack_owner |
| f57afa620deb40f49da54cea32921e75 | now_test-role |
+----------------------------------+------------------+

[wrsroot@controller-0 ~(keystone_admin)]$ dcmanager subcloud manage subcloud-5
+-----------------------------+----------------------------+
| Field | Value |
+-----------------------------+----------------------------+
| id | 3 |
| name | subcloud-5 |
| description | wcp87 subcloud |
| location | ottawa lab |
| software_version | 18.10 |
| management | managed |
| availability | online |
| management_subnet | 10.10.2.16/28 |
| management_start_ip | 10.10.2.18 |
| management_end_ip | 10.10.2.30 |
| management_gateway_ip | 10.10.2.17 |
| systemcontroller_gateway_ip | 10.10.3.1 |
| created_at | 2018-10-11T19:58:02.576970 |
| updated_at | 2018-10-13T14:45:21.853437 |
+-----------------------------+----------------------------+
[wrsroot@controller-0 ~(keystone_admin)]$ openstack role delete f57afa620deb40f49da54cea32921e75
[wrsroot@controller-0 ~(keystone_admin)]$ openstack role list
+----------------------------------+------------------+
| ID | Name |
+----------------------------------+------------------+
| e675f74b138f46f9b22ad576b56291ea | admin |
| 9fe2ff9ee4384b1894a90878d3e92bab | _member_ |
| 0b2862c1f04b4b2dab5ab0c0ec683697 | heat_stack_user |
| 7c3618a17880420e8190713c47eb1edb | heat_stack_owner |
+----------------------------------+------------------+
[wrsroot@controller-0 ~(keystone_admin)]$ date
Sat Oct 13 15:12:01 UTC 2018

On manage subcloud-4:

[wrsroot@controller-0 ~(keystone_admin)]$ openstack role list
+----------------------------------+-----------------+
| ID | Name |
+----------------------------------+-----------------+
| 93a01a9edde24e95b4780552ae702272 | admin |
| 9fe2ff9ee4384b1894a90878d3e92bab | _member_ |
| 46fe795c74f6430cb9da75d314713ff8 | heat_stack_user |
| 2508528504b04c97979d7662bdc646ec | now_test-role |
+----------------------------------+-----------------+
[wrsroot@controller-0 ~(keystone_admin)]$ collect all
[sudo] password for wrsroot:
collecting data from 2 host(s): controller-0 controller-1
collecting controller-0_20181013.151255 ... done (00:01:34 42M)
collecting controller-1_20181013.151255 ... done (00:00:33 31M)
creating all-nodes tarball /scratch/ALL_NODES_20181013.151255.tar ... done (00:02:08 73M)
[wrsroot@controller-0 ~(keystone_admin)]$ openstack role delete 2508528504b04c97979d7662bdc646ec
[wrsroot@controller-0 ~(keystone_admin)]$ openstack role list
+----------------------------------+-----------------+
| ID | Name |
+----------------------------------+-----------------+
| 93a01a9edde24e95b4780552ae702272 | admin |
| 9fe2ff9ee4384b1894a90878d3e92bab | _member_ |
| 46fe795c74f6430cb9da75d314713ff8 | heat_stack_user |
+----------------------------------+-----------------+

On unmanage subcloud-5:

[wrsroot@controller-0 ~(keystone_admin)]$ openstack role list
+----------------------------------+-----------------+
| ID | Name |
+----------------------------------+-----------------+
| 5a08fb12fe2b48009368031ca3ba037b | admin |
| 9fe2ff9ee4384b1894a90878d3e92bab | _member_ |
| 1d9ba222bbd8421eb39766cd12b4c74a | heat_stack_user |
| ab07b5b4984a4afc9288859101891dc7 | now_test-role |
+----------------------------------+-----------------+