Don't set fs.file-max and vm.swappiness by default

Users can easily configure this themselves and it it strongly preferred
if idiosyncratic changes such as this are not part of the default
behaviour.

sysctl/defaults.yml

@@ -4,12 +4,3 @@ sysctl:
   pkg: procps-ng
   config:
     location: '/etc/sysctl.d'
-  lookup:
-    params:
-      -
-        name: fs.file-max
-        value: 100000
-        config: fs.conf
-      -
-        name: vm.swappiness
-        value: 20