debian packaging: add transitional package for python3-qgis(-common)

(cherry picked from commit cfe8852)

Author: jef-n

debian/control

@@ -473,3 +473,20 @@ Description: QGIS API documentation
  display databases of geographic information.
  .
  This package contains the QGIS API documentation.
+
+Package: python-qgis
+Depends: python3-qgis, ${misc:Depends}
+Architecture: all
+Priority: optional
+Section: oldlibs
+Description: transitional package
+ This is a transitional package. It can safely be removed.
+
+Package: python-qgis-common
+Depends: python3-qgis-common, ${misc:Depends}
+Architecture: all
+Priority: optional
+Section: oldlibs
+Description: transitional package
+ This is a transitional package. It can safely be removed.
+

debian/control.in

@@ -491,3 +491,20 @@ Description: QGIS API documentation
 #oracle# display databases of geographic information.
 #oracle# .
 #oracle# This package contains the QGIS oracle provider.
+
+Package: python-qgis
+Depends: python3-qgis, ${misc:Depends}
+Architecture: all
+Priority: optional
+Section: oldlibs
+Description: transitional package
+ This is a transitional package. It can safely be removed.
+
+Package: python-qgis-common
+Depends: python3-qgis-common, ${misc:Depends}
+Architecture: all
+Priority: optional
+Section: oldlibs
+Description: transitional package
+ This is a transitional package. It can safely be removed.
+