Standardise empty lines throughout codebase

Done with `rubocop --auto-correct --only EmptyLineBetweenDefs,EmptyLines,EmptyLinesAroundBody`

lib/fog/openvz/requests/compute/mount_server.rb

@@ -2,19 +2,15 @@ module Fog
   module Compute
     class Openvz
       class Real
-
         def mount_server(id, options = {})
           vzctl("mount",{:ctid => id}.merge(options))
         end
-
       end
 
       class Mock
-
         def mount_server(id, options = {})
           Fog::Mock.not_implemented
         end
-
       end
     end
   end