Description of problem:

when adding alternative content source, it is possible to save it even, if baseurl path is red, if IP address instead of fqdn is specified in path. Which is fine. However valid IP address should be a option along with fqdn.

There are deployments without DNS
Also not-having DNS as single point of failure for alternative content source, can be good practice.

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

How reproducible:

100%

Steps to Reproduce:
1.create new content source
2.as a path https://10.37.195.233./pulp/content/ instead of https://rhui-server.example.com/pulp/content
3.next

Actual results:

Red warning appears, yet it allows to save the content source

Expected results:

Valid IP shows as green as well as valid fqdn.

Additional info:

If back button is pressed, and than again next, red warning does not appear