cmds.distro.CmdXxx: Rename to cmds.pkg.CmdXxx

With the exception of the "info" subcommand, nearly all of distro's
subcommands deal with package managing, so push them into their own
command category.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/CmdPkg.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+
+from argparse import ArgumentParser
+
+from ..App import App
+from .Cmd import Cmd as CmdBase
+
+class CmdPkg(CmdBase): # export
+
+    def __init__(self, parent: App) -> None:
+        super().__init__(parent, 'pkg', help="System package manager wrapper")
+        self._add_subcommands()
+
+    def add_arguments(self, p: ArgumentParser) -> None:
+        super().add_arguments(p)