Handle tabs when indenting <VirtualHost> content.

Expand tabs before indenting the lines provided as the configuration
for a named virtual host (apache::named_vhost).  This will give users
the expected indentation in the generated vhost-NAME.conf file even
if they use TAB characters in their config lines.

This is only for aesthetics; the semantics of the configuration should
not be affected.

templates/named_vhost.conf.erb

@@ -92,6 +92,11 @@ NameVirtualHost <%= addr %>
 <% end -%>
 <VirtualHost <%= server_addrs.join(' ') %>>
 
-<%= vhostcfg.join("\n").gsub(/^./, '    \&') %>
+<% vhostcfg.each do |chunk|
+      # Expand tabs and indent four spaces
+      chunk = chunk.gsub(/([^\t\n]*)\t/) { $1 + " " * (8 - ($1.size % 8)) }
+-%>
+<%=   chunk.rstrip.gsub(/^./, '    \&') %>
+<% end -%>
 
 </VirtualHost>