[api] fix execution of automatic request approval

also introducing default admin user definition and do some cleanup
[backend] publish: use hard links instead of symlinks for arch metadata

Our download redirector follows the links, this confuses arch's installer.
[API] Fix wierd ldap code.
[API] fix 500 error on first login.
[API] Fix realname extracting during creation from ldap.
[backend] implement product description parsing for source server
[api] basic product tracking
[api] find patchinfo packages by package kind and not via package name convention
[api] basic channel tracking