cleanup: Remove trailing whitespace from all python files

Using the command below, remove all trailing whitespace characters from python
files in the MOM source.  This will help make MOM code cleaner and will avoid
incremental whitespace noise in future patches.

Change-Id: Ibb4ccce9c0cb6884d9d75b04f72c885a272490ed
Signed-off-by: Adam Litke <agl@us.ibm.com>
Reviewed-on: http://gerrit.ovirt.org/13761