pylint: increase max attributes to 10

In three places we have more than 7 instances attributes, but less
then 10; instead of disabling the warning for all these cases,
increase the limit to a reasonable size of 10 and re-enable the
warnings in all the places.

assemblers/org.osbuild.qemu

@@ -201,7 +201,6 @@ class Filesystem:
         maker(device, self.uuid, self.label)
 
 
-# pylint: disable=too-many-instance-attributes
 class Partition:
     def __init__(self,
                  pttype: str = None,