Description of problem:
After deployment and initialization, the displayed url for horizon is:
http://192.0.2.9:/admin

1) There is a redundant ":" in the url
2) The "/admin" path should be "/dashboard"


How reproducible:
100%


Steps to Reproduce:
1. Install the undercloud
2. Register nodes
3. Make a deployment
4. Initialize the deployment


Actual results:
When all is successful, the url for horizon will be displayed in the "overview" page. If you try this url it won't work.