Update for pkgutil namespace packages

debian/control

-Source: <module-name>
+Source: <dash-separated-module-name>
 Maintainer: Software Heritage developers <swh-devel@inria.fr>
 Section: python
 Priority: optional
 Build-Depends: debhelper (>= 9),
-               dh-python,
+               dh-python (>= 2),
                python3-all,
                python3-nose,
                python3-setuptools,
@@ -11,7 +11,7 @@ Build-Depends: debhelper (>= 9),
                python3-swh.storage,
                python3-vcversioner
 Standards-Version: 3.9.6
-Homepage: https://forge.softwareheritage.org/diffusion/<PHABRICATOR_CALLSIGN>/
+Homepage: https://forge.softwareheritage.org/source/<phabricator short name>/
 
 Package: python3-<dot-separated-name-module>
 Architecture: all

debian/rules

 #!/usr/bin/make -f
 
-export PYBUILD_NAME=<dash-separated-module-name>
+export PYBUILD_NAME=<dot-separated-module-name>
+export PYBUILD_TEST_ARGS=--with-doctest -sva !db,!fs
 
 %:
 	dh $@ --with python3 --buildsystem=pybuild
-
-
-override_dh_auto_test:

swh/__init__.py

+__path__ = __import__('pkgutil').extend_path(__path__, __name__)