do not create a python package

... where there is no package.
Only a script was installed from the setup.py
but catkin provides a separate command for that
http://docs.ros.org/en/jade/api/catkin/html/howto/format2/installing_python.html

I retained the installation to the global path. It is unusual to do
that, but it has been like that for a long time.

This started failing with recent setuptools with the following error
message:

---
error: Multiple top-level packages discovered in a flat-layout: ['debian', 'config', 'launch'].

To avoid accidental inclusion of unwanted files or directories,
setuptools will not proceed with this build.

If you are trying to create a single distribution with multiple packages
on purpose, you should not rely on automatic discovery.
Instead, consider the following options:

1. set up custom discovery (`find` directive with `include` or `exclude`)
2. use a `src-layout`
3. explicitly set `py_modules` or `packages` with a list of names

To find more information, look for "package discovery" on setuptools docs.
---

fetch_calibration/CMakeLists.txt

@@ -2,7 +2,6 @@ cmake_minimum_required(VERSION 3.0.2)
 project(fetch_calibration)
 
 find_package(catkin)
-catkin_python_setup()
 catkin_package()
 
 install(DIRECTORY config
@@ -13,7 +12,12 @@ install(DIRECTORY launch
   DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
 )
 
-install(
+catkin_install_python(
   PROGRAMS scripts/camera_reconfigure.py
   DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
 )
+
+catkin_install_python(
+   PROGRAMS scripts/calibrate_robot
+   DESTINATION ${CATKIN_GLOBAL_BIN_DESTINATION}
+)

fetch_calibration/package.xml

@@ -20,8 +20,6 @@
   <url type="repository">https://github.com/fetchrobotics/fetch_ros</url>
 
   <buildtool_depend>catkin</buildtool_depend>
-  <buildtool_depend condition="$ROS_PYTHON_VERSION == 2">python-setuptools</buildtool_depend>
-  <buildtool_depend condition="$ROS_PYTHON_VERSION == 3">python3-setuptools</buildtool_depend>
 
   <exec_depend version_gte="0.5.1">robot_calibration</exec_depend>
 </package>