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.

.pylintrc

@@ -4,3 +4,6 @@ max-line-length=120
 
 [TYPECHECK]
 ignored-classes=osbuild.loop.LoopInfo
+
+[DESIGN]
+max-attributes=10

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,

osbuild/objectstore.py

@@ -40,7 +40,6 @@ def umount(target, lazy=True):
     subprocess.run(["umount"] + args + [target], check=True)
 
 
-# pylint: disable=too-many-instance-attributes
 class Object:
     def __init__(self, store: "ObjectStore"):
         self._init = True

osbuild/sources.py

@@ -6,7 +6,6 @@ from .util import jsoncomm
 
 
 class SourcesServer:
-    # pylint: disable=too-many-instance-attributes
     def __init__(self, socket_address, libdir, options, cache, output):
         self.socket_address = socket_address
         self.libdir = libdir