Don't hardcode 127.0.0.1 in salt-api configuration

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).

spacewalk/setup/salt/susemanager.conf

@@ -1,7 +1,7 @@
 # Setup cherrypy
 rest_cherrypy:
   port: 9080
-  host: 127.0.0.1
+  host: localhost
   collect_stats: false
   expire_responses: false
   ssl_crt: /etc/salt/pki/api/salt-api.crt

spacewalk/setup/spacewalk-setup.changes.cbosdo.5.0-salt-api-ip

@@ -0,0 +1 @@
+- Salt API should listen on localhost rather than 127.0.0.1 (bsc#1230865)