Add some distutils.dist.Distribution attrs (#2620)

stdlib/2and3/distutils/command/install.pyi

@@ -0,0 +1,14 @@
+from distutils.cmd import Command
+from typing import Optional, Text
+
+
+class install(Command):
+    user: bool
+    prefix: Optional[Text]
+    home: Optional[Text]
+    root: Optional[Text]
+    install_lib: Optional[Text]
+
+    def initialize_options(self) -> None: ...
+    def finalize_options(self) -> None: ...
+    def run(self) -> None: ...

stdlib/2and3/distutils/dist.pyi

@@ -1,7 +1,11 @@
 # Stubs for distutils.dist
+from distutils.cmd import Command
 
-from typing import Any, Mapping, Optional
+from typing import Any, Mapping, Optional, Dict, Tuple, Iterable, Text
 
 
 class Distribution:
     def __init__(self, attrs: Optional[Mapping[str, Any]] = ...) -> None: ...
+    def get_option_dict(self, command: str) -> Dict[str, Tuple[str, Text]]: ...
+    def parse_config_files(self, filenames: Optional[Iterable[Text]] = ...) -> None: ...
+    def get_command_obj(self, command: str, create: bool = ...) -> Optional[Command]: ...