d/rules: Migrate to pytest

Related T1525

debian/rules

 #!/usr/bin/make -f
 
 export PYBUILD_NAME=swh.loader.tar
-export export PYBUILD_TEST_ARGS=--with-doctest -sv -a !db,!fs
+export PYBUILD_TEST_ARGS=-v -m "not db and not fs"
 
 %:
 	dh $@ --with python3 --buildsystem=pybuild

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T1525 is now swh/infra/puppet/puppet-swh-site#1525 (closed)