Rename cdist.py to scripts/cdist to avoid self import

naming cdist cdist.py and running import cdist, imports itself and thus raises an interesting error:

(virtualenv)[7:47] brief:virtualenv% cdist.py
Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 1512, in _find_and_load_unlocked
AttributeError: 'module' object has no attribute '__path__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/users/nico/oeffentlich/rechner/projekte/cdist/virtualenv/bin/cdist.py", line 230, in <module>
    commandline()
  File "/home/users/nico/oeffentlich/rechner/projekte/cdist/virtualenv/bin/cdist.py", line 27, in commandline
    import cdist.banner
ImportError: No module named 'cdist.banner'; cdist is not a package

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/users/nico/oeffentlich/rechner/projekte/cdist/virtualenv/bin/cdist.py", line 235, in <module>
    except cdist.Error as e:
AttributeError: 'module' object has no attribute 'Error'

Also described on

    http://www.velocityreviews.com/forums/t953596-error-executing-import-html-parser-from-a-script.html

Signed-off-by: Nico Schottelius <nico@brief.schottelius.org>

bin/cdist

@@ -22,5 +22,8 @@
 
 # Wrapper for real script to allow execution from checkout
 dir=${0%/*}
+
+# Ensure version is present - the bundled/shipped version contains a static version,
+# the git version contains a dynamic version
 "$dir/../build" version
-"$dir/../cdist.py" "$@"
+PYTHONPATH="${dir}/../" "$dir/../scripts/cdist" "$@"