Description of problem:

Calling subscription-manager orgs with a user who has @ in their name fails. Here's an example of the command:

subscription-manager orgs --username "gkhachik" --password "asd\!" 

The response is "Resource not found on server"

Here's an example curl request which returns a 404:

curl http://127.0.0.1:3000/katello/api/users/admin@mail.com/owners -u "admin:admin"

For more info you can visit https://bugzilla.redhat.com/show_bug.cgi?id=956650#c12. 


Steps to Reproduce:
1. Create a user with @ in their username
2. Call subscription-manager orgs on a client using that user you've created.


Actual results:

Resource not found.


Expected results:

List of orgs.