Description of problem:

Creating proxy with auth via Infrastructure -> HTTP proxies , when running test connection it fails with:
~~~
407 "Proxy Authentication Required"
~~~

While the credentials for the proxy are valid and curl works fine

Version-Release number of selected component (if applicable):
Satellite 6.9

How reproducible:
100%

Steps to Reproduce:
1. Create proxy which requires authentication
2. Create proxy via infrastructure -> HTTP Proxies
3.

Actual results:
~~~
407 "Proxy Authentication Required"
~~~


Expected results:
Test to be a success

Additional info: