Description of problem:
When using spacewalk-proxy the $server variable is not fully replaced to point to the spacewalk-proxy server instead of the spacewalk server.

Version-Release number of selected component (if applicable):
spacewalk proxy 1.8

How reproducible:
Create a kickstart profile that contains the $server variable in a post script. Then download the kickstart profile from the spacewalk-proxy server.  It should replace all of the $server variables with the spacewalk-proxy hostname or ip
For example:
wget $server/test
gets translated to on the spacewalk-proxy as
wget <spacewalk-proxy ip>.<spacewalk server domain name>/test

  
Actual results:
$server gets replaced with <spacewalk-proxy host>.<spacewalk domain name>

Expected results:
$server gets replaced with spacewalk-proxy host