drop the mirrors from boot.cfg

src/boot.cfg

@@ -6,13 +6,8 @@ set site_name netboot.xyz
 # set boot domain
 set boot_domain boot.netboot.xyz
 
-# set mirror list
-set mirror_one mirror.rackspace.com
-set mirror_two mirrors.kernel.org
-set mirror_three mirrors.test.blah.com
-
 # set mirror domain
-set mirror ${mirror_one}
+set mirror mirror.rackspace.com
 
 # set location of memdisk
 set memdisk http://${boot_domain}/memdisk