python3: update debian files to build python3 deb

Signed-off-by: Julien Fortin <julien@cumulusnetworks.com>

debian/control

@@ -4,21 +4,21 @@ Priority: optional
 Maintainer: Julien Fortin <julien@cumulusnetworks.com>
 Build-Depends: debhelper (>=9),
                dh-systemd,
-               dh-python,
-               python-all,
-               python-setuptools,
-               python-docutils
+               python3,
+               python3-all,
+               python3-setuptools,
+               python3-docutils
 Standards-Version: 4.2.1
 Homepage: https://github.com/cumulusnetworks/ifupdown2
-X-Python-Version: >= 2.7
+X-Python-Version: >= 3.7
 
 Package: ifupdown2
 Architecture: all
 Provides: ifupdown
 Conflicts: ifupdown
 Replaces: ifupdown
-Depends: ${python:Depends}, ${misc:Depends}, iproute2, python-argcomplete, python-ipaddr
-Suggests: isc-dhcp-client, bridge-utils, ethtool, python-gvgen, python-mako
+Depends: ${python:Depends}, ${misc:Depends}, iproute2, python3-argcomplete
+Suggests: isc-dhcp-client, bridge-utils, ethtool, python3-gvgen, python3-mako
 Description: Network Interface Management tool similar to ifupdown
  ifupdown2 is ifupdown re-written in Python. It replaces ifupdown and provides
  the same user interface as ifupdown for network interface configuration.

debian/ifupdown2.postinst

@@ -92,14 +92,6 @@ case "$1" in
         process_udev
         chmod +x /usr/share/ifupdown2/__main__.py
         postinst_remove_diverts
-
-	#### WORK AROUND
-	# We have to manually install pip3
-	# apt-get install python3-pip -y
-	echo "Please make sure that python3-pip is installed, run: apt-get install python3-pip -y"
-	pip3 install wheel
-	pip3 install setuptools
-	pip3 install ipaddr
     ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)

debian/rules

@@ -5,7 +5,7 @@ export PYBUILD_NAME=ifupdown2
 export PYBUILD_INSTALL_ARGS=--install-lib=/usr/share/ --install-scripts=/usr/share/
 
 %:
-	dh $@ --with python2 --with systemd --buildsystem=pybuild
+	dh $@ --with=python3 --with systemd --buildsystem=pybuild
 
 override_dh_installman:
 	./ifupdown2/man/genmanpages.sh ./ifupdown2/man ./man