debian: use PYBUILD_NAME (#41634)

debian/combo.install

@@ -1,6 +1,4 @@
-debian/combo.service      /lib/systemd/system
 debian/combo-manage       /usr/bin
 debian/settings.py        /etc/combo
 debian/uwsgi.ini          /etc/combo
 debian/debian_config.py   /usr/lib/combo
-usr/bin/manage.py         /usr/lib/combo

debian/python3-combo.install

@@ -1 +0,0 @@
-usr/lib/python3.*

debian/rules

@@ -1,7 +1,12 @@
 #!/usr/bin/make -f
 # -*- makefile -*-
 
+export PYBUILD_NAME=combo
 export PYBUILD_DISABLE=test
 
 %:
 	dh $@ --with python3,systemd --buildsystem=pybuild
+
+override_dh_install:
+	dh_install
+	mv $(CURDIR)/debian/python3-combo/usr/bin/manage.py $(CURDIR)/debian/combo/usr/lib/combo/manage.py