several: change attr.cmp for attr.eq

Fix several warnings of the form:
  subiquity/common/errorreport.py:83
    DeprecationWarning: The usage of `cmp` is deprecated and will be
    removed on or after 2021-06-01.
    Please use `eq` and `order` instead.

See https://www.attrs.org/en/stable/changelog.html?highlight=cmp#id76
Minimum version needed for this is 19.2.0 of attrs, and focal has 19.3.

subiquity/common/errorreport.py

@@ -49,7 +49,7 @@ from subiquity.common.types import (
 log = logging.getLogger('subiquitycore.common.errorreport')
 
 
-@attr.s(cmp=False)
+@attr.s(eq=False)
 class Upload(metaclass=urwid.MetaSignals):
     signals = ['progress']
 
@@ -80,7 +80,7 @@ class Upload(metaclass=urwid.MetaSignals):
         os.close(self.pipe_r)
 
 
-@attr.s(cmp=False)
+@attr.s(eq=False)
 class ErrorReport(metaclass=urwid.MetaSignals):
 
     signals = ["changed"]

subiquity/common/types.py

@@ -345,7 +345,7 @@ class ChannelSnapInfo:
         metadata={'time_fmt': '%Y-%m-%dT%H:%M:%S.%fZ'})
 
 
-@attr.s(auto_attribs=True, cmp=False)
+@attr.s(auto_attribs=True, eq=False)
 class SnapInfo:
     name: str
     summary: str = ''

subiquity/models/filesystem.py

@@ -120,7 +120,7 @@ def fsobj(typ):
         c.type = attributes.const(typ)
         c.id = attr.ib(default=None)
         c._m = attr.ib(repr=None, default=None)
-        c = attr.s(cmp=False, repr=False)(c)
+        c = attr.s(eq=False, repr=False)(c)
         c.__repr__ = fsobj__repr
         _type_to_cls[typ] = c
         return c
@@ -157,7 +157,7 @@ def reverse_dependencies(obj):
             yield v
 
 
-@attr.s(cmp=False)
+@attr.s(eq=False)
 class RaidLevel:
     name = attr.ib()
     value = attr.ib()
@@ -420,7 +420,7 @@ def asdict(inst):
 # in the FilesystemModel or FilesystemController classes.
 
 
-@attr.s(cmp=False)
+@attr.s(eq=False)
 class _Formattable(ABC):
     # Base class for anything that can be formatted and mounted,
     # e.g. a disk or a RAID or a partition.
@@ -482,7 +482,7 @@ class _Formattable(ABC):
 GPT_OVERHEAD = 2 * (1 << 20)
 
 
-@attr.s(cmp=False)
+@attr.s(eq=False)
 class _Device(_Formattable, ABC):
     # Anything that can have partitions, e.g. a disk or a RAID.