(2.12) Convert QmpMessage to a new-style class
(2.12) Convert QmpMessage to a new-style class

Signed-off-by: Apollon Oikonomopoulos <ed81ed0a45ccd5c8869bda52e38353a6299ee39e@gmail.com>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

apyrgio/snf-ganeti,apyrgio/snf-ganeti