Remove obsolete verbose arguments from packaging.

Logging replaces verbose arguments.  I haven’t fixed the example in
Doc/install/install.rst because I have major fixes and changes to the
oc under way and will fix or remove that example as part of that task.
diff --git a/Lib/packaging/command/cmd.py b/Lib/packaging/command/cmd.py
index 333b99d..25e6a72 100644
--- a/Lib/packaging/command/cmd.py
+++ b/Lib/packaging/command/cmd.py
@@ -351,7 +351,7 @@
     def execute(self, func, args, msg=None, level=1):
         util.execute(func, args, msg, dry_run=self.dry_run)
 
-    def mkpath(self, name, mode=0o777, dry_run=None, verbose=0):
+    def mkpath(self, name, mode=0o777, dry_run=None):
         if dry_run is None:
             dry_run = self.dry_run
         name = os.path.normpath(name)
@@ -367,9 +367,11 @@
 
     def copy_file(self, infile, outfile,
                   preserve_mode=True, preserve_times=True, link=None, level=1):
-        """Copy a file respecting verbose, dry-run and force flags.  (The
-        former two default to whatever is in the Distribution object, and
-        the latter defaults to false for commands that don't define it.)"""
+        """Copy a file respecting dry-run and force flags.
+
+        (dry-run defaults to whatever is in the Distribution object, and
+        force to false for commands that don't define it.)
+        """
         if self.dry_run:
             # XXX add a comment
             return
@@ -380,11 +382,13 @@
 
     def copy_tree(self, infile, outfile, preserve_mode=True,
                   preserve_times=True, preserve_symlinks=False, level=1):
-        """Copy an entire directory tree respecting verbose, dry-run,
+        """Copy an entire directory tree respecting dry-run
         and force flags.
         """
         if self.dry_run:
-            return  # see if we want to display something
+            # XXX should not return but let copy_tree log and decide to execute
+            # or not based on its dry_run argument
+            return
 
         return util.copy_tree(infile, outfile, preserve_mode, preserve_times,
             preserve_symlinks, not self.force, dry_run=self.dry_run)
@@ -392,7 +396,7 @@
     def move_file(self, src, dst, level=1):
         """Move a file respecting the dry-run flag."""
         if self.dry_run:
-            return  # XXX log ?
+            return  # XXX same thing
         return move(src, dst)
 
     def spawn(self, cmd, search_path=True, level=1):