qapi: More idiomatic string operations Rather than slicing the end of a string, we can use python's endswith(). And rather than creating a set of characters, we can search for a character within a string. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1445898903-12082-3-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>