- fixed nested File::Find method fixupLinks in cloneImage
  * entities found in $File::Find::name always exists, thus it's
    not needed to check their existence
  * moved the code searching for links with relative pointer
    into a perl closure method named findLinksRelative
  * moved the code fixing broken relative links into its
    own code block
- make sure etc/sysconfig directory exists before temporary
  copying the proxy configuration into the chroot