Don't hardcode 127.0.0.1 in salt-api configuration

[cbosdo]

What does this PR change?

Tomcat accesses the salt api using localhost but the salt-api is configured to listen on 127.0.0.1. This works fine until IPv4 is disabled on the host or the 127.0.0.1 line is commented out in /etc/hosts.

In order to make sure both sides are on the same page, use localhost in the salt-api too (bsc#1230865).

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

ℹ️ If a major new functionality is added, it is strongly recommended that tests for the new functionality are added to the Cucumber test suite

• No tests: requires test with disabled IPv4
• DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/25318
Port(s): https://github.com/SUSE/spacewalk/pull/26042

• DONE

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