Use setuptools for packaging

According to https://docs.python.org/3/library/distutils.html the
setuptools are used in place of distutils anyway. Using it directly
allows us to make packaging more flexible: specify dependencies,
automatically find package name etc.

Change-Id: I39ee53f352001e47c6df055cbec52d638480253d

osmopy/__init__.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-__version__ = '0.0.2'
+__version__ = '0.0.3'
 
 __all__ = ['obscvty',  'osmodumpdoc',  'osmotestconfig',  'osmotestvty',
            'osmoutil',

setup.py

@@ -15,7 +15,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from distutils.core import setup
+from setuptools import setup, find_packages
 from osmopy import __version__
 import sys
 
@@ -35,7 +35,7 @@ elif sys.version_info.major == 3:
 setup(
     name = 'osmopython',
     version = __version__,
-    packages = ["osmopy"],
+    packages = find_packages(),
     scripts = scripts,
     license = "AGPLv3",
     description = "Osmopython: osmocom testing scripts",