python: Fix .PHONY Make specifiers

I missed the 'check-tox' target. Add that, but split the large .PHONY
specifier at the top into its component pieces and move them near the
targets they describe so that they're much harder to forget to update.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Message-id: 20210629214323.1329806-10-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

python/Makefile

-.PHONY: help pipenv check-pipenv check clean distclean develop
-
+.PHONY: help
 help:
 	@echo "python packaging help:"
 	@echo ""
@@ -29,25 +28,32 @@ help:
 	@echo "                 built distribution files, and everything"
 	@echo "                 from 'make clean'."
 
+.PHONY: pipenv
 pipenv: .venv
 .venv: Pipfile.lock
 	@PIPENV_VENV_IN_PROJECT=1 pipenv sync --dev --keep-outdated
 	@touch .venv
 
+.PHONY: check-pipenv
 check-pipenv: pipenv
 	@pipenv run make check
 
+.PHONY: develop
 develop:
 	pip3 install -e .[devel]
 
+.PHONY: check
 check:
 	@avocado --config avocado.cfg run tests/
 
+.PHONY: check-tox
 check-tox:
 	@tox
 
+.PHONY: clean
 clean:
 	python3 setup.py clean --all
 
+.PHONY: distclean
 distclean: clean
 	rm -rf qemu.egg-info/ .venv/ .tox/ dist/