[COOK-4373] Add conditional output of optional attribute for cache_peer to template

Signed-off-by: Sean OMeara <someara@opscode.com>
[COOK-4376] remove duplicated attributes

Signed-off-by: Sean OMeara <someara@opscode.com>
[COOK-4377] Generate a sysconfig on Fedora as well

Signed-off-by: Sean OMeara <someara@opscode.com>