Remove namespace packages

Author: wosc

fs/__init__.py

@@ -1,8 +1,6 @@
 """Python filesystem abstraction layer.
 """
 
-__import__("pkg_resources").declare_namespace(__name__)  # type: ignore
-
 from . import path
 from ._fscompat import fsdecode, fsencode
 from ._version import __version__

fs/opener/__init__.py

@@ -2,9 +2,6 @@
 """Open filesystems from a URL.
 """
 
-# Declare fs.opener as a namespace package
-__import__("pkg_resources").declare_namespace(__name__)  # type: ignore
-
 # Import opener modules so that `registry.install` if called on each opener
 from . import appfs, ftpfs, memoryfs, osfs, tarfs, tempfs, zipfs