Upstream bug has been fixed, since imaplib2 v2.42 the untagged responses are
flushed (as stated by the documentation).
See https://sourceforge.net/p/imaplib2/bugs/7/
Signed-off-by: Pierre-Louis Bonicoli <pierre-louis.bonicoli@gmx.fr>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>