Description of problem:

Unlike other openstack cli commands, that prevents duplicate objects creation with same name (returning "Conflict occurred attempting to store ..."), the "router create" command - does allow to create multiple routers with same name in same project.


Version-Release number of selected component:
OSP 13 - 2018-03-20.2

How reproducible: 
always


Steps to Reproduce:

(overcloud) [stack@undercloud-0 ~]$ 
$ openstack project create test_cloud --enable

Conflict occurred attempting to store project - it is not permitted to have two projects with the same name in the same domain : test_cloud. (HTTP 409) 

$ openstack user create tester --enable --password testerpass --project test_cloud 

Conflict occurred attempting to store user - Duplicate entry found with name tester at domain ID default. (HTTP 409) 


$ openstack router create internal_router
...
| id                      | a2b97aa1-50f7-4e44-abcd-41468998703b |
| name                    | internal_router                      |

$ openstack router create internal_router
...
| id                      | 8c2f09d3-0677-4632-9251-b498d570a96e |
| name                    | internal_router                      |

$ openstack router list
+--------------------------------------+-----------------+--------+-------+-------------+-------+----------------------------------+
| ID                                   | Name            | Status | State | Distributed | HA    | Project                          |
+--------------------------------------+-----------------+--------+-------+-------------+-------+----------------------------------+
| 8c2f09d3-0677-4632-9251-b498d570a96e | internal_router | ACTIVE | UP    | False       | False | 676572adef8e41999011e22234871c31 |
| a2b97aa1-50f7-4e44-abcd-41468998703b | internal_router | ACTIVE | UP    | False       | False | 676572adef8e41999011e22234871c31 |
+--------------------------------------+-----------------+--------+-------+-------------+-------+----------------------------------+


Expected results:

A second attempt to run "openstack router create internal_router" should probably return:

Conflict occurred attempting to store router - Duplicate entry found with name internal_router at project ID test_cloud. (HTTP 409)