remove trailing newlines form python modules

pylint-1.6.4-1.fc26.noarch reports these, hence they should be fixed in order
to build FreeIPA with this version

https://fedorahosted.org/freeipa/ticket/6391

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipaserver/plugins/selfservice.py

@@ -214,4 +214,3 @@ class selfservice_show(crud.Retrieve):
             result=result,
             value=pkey_to_value(aciname, kw),
         )
-