[debian] Use pybuild

Bump min python2 version along the way.

debian/changelog

 cubicweb-forgotpwd (0.9.0-2) UNRELEASED; urgency=medium
 
   * Switch to 3.0 (quilt) format
+  * Use pybuild
 
  -- Denis Laxalde <denis.laxalde@logilab.fr>  Wed, 26 Jun 2019 10:11:05 +0200
 

debian/control

@@ -4,10 +4,11 @@ Priority: optional
 Maintainer: LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
 Build-Depends:
  debhelper (>= 9),
- python (>= 2.6.5),
+ python-all (>= 2.7),
  dh-python,
  python-setuptools,
 Standards-Version: 3.9.6
+X-Python-Version: >= 2.7
 Homepage: http://www.cubicweb.org/project/cubicweb-forgotpwd
 
 Package: cubicweb-forgotpwd

debian/rules

 #!/usr/bin/make -f
 
+export PYBUILD_NAME=cubicweb-forgotpwd
+
 %:
-	dh $@ --with python2
+	dh $@ --with python2 --buildsystem=pybuild