Description of problem:

This looks to be a regression from Erratum RHBA-2016:1866-1

When creating a kickstart profile in 5.6 the media_path get incorrectly set to the /rhn/kickstart/ path which results in the request getting sent directly to tomcat resulting in a 404. the media path should most likely be the /ks/dist path so the url is properly handed by the rewrite rule in apache: 

RewriteRule ^/ks/dist(.*)$ /rhn/common/DownloadFile.do?url=/ks/dist$1

code commit where problem introduced in commit b3e3e1609102d4486a38d905a4a9064f8731d5d0

+++ b/java/code/src/com/redhat/rhn/manager/kickstart/cobbler/CobblerProfileCommand.java
@@ -106,6 +106,9 @@ public abstract class CobblerProfileCommand extends CobblerCommand {
 
         Map meta = profile.getKsMeta();
         meta.put("org", this.ksData.getOrg().getId());
+        if (this.ksData.getUrl().startsWith("/")) {
+            meta.put("media_path", this.ksData.getUrl());
+        }
         profile.setKsMeta(meta);