puppet3: fix videoscaler role

Fixed the lookup of classes as puppet 3 if you use 'include foo'
will lookup its actual namespace.

So if you do 'include foo' withing 'role::foo::baz' it will try to
include 'role::foo' and not the class 'foo' you defined as an autoload
module.

The solution is to use 'include ::foo' to tell puppet to search
correctly from the top scope for it. Yes this *is* *really* *really*
elegant and beautiful to read...

Change-Id: Ie52f8d7a135290cce0c14148ca6f63381b31fd59
Signed-off-by: Giuseppe Lavagetto <glavagetto@wikimedia.org>