Description of problem:

When a developer edits her route, if new hostname entered is the same as the one which already exists in another project, the route will seem to be  successfully updated when doing 'oc get route', but the old hostname will still serves the requests to the service. Additionally, in this case, even if the developer deletes the route, the old hostname will still do the same.

Version-Release number of selected component (if applicable):
oc v1.1.1.1
kubernetes v1.1.0-origin-1107-g4c8e6f4

How reproducible:
100%

Steps to Reproduce:
1. create a project and an app and expose it with 'www.example.com' as a hostname 
2. create another project and an app and expose it with 'www2.example.com' 
3. edit the hostname of the route in (2) from 'www2.example.com' to 'www.example.com'
4. send request to 'www2.example.com'
5. delete the route in (2)
6. send request to 'www2.example.com'

Actual results:
When doing 'oc get route' after (3), the route has been modified to 'www.example.com', but the requests were able to be made to the service via 'www2.example.com'.

Expected results:
A proper error handling is required.

Additional info: