lib-storage: Make sure mailbox list notification flush sees latest changes. This is mainly useful with imaptest test scripts to make sure they're seeing the changes done by the other session, without assuming that inotify will always notify about the change before NOOP is run (it doesn't). Do this only if mailbox_idle_check_interval>0, so it's not run when periodic stat()s are wanted to be avoided.

[Unit]
Description=Dovecot IMAP/POP3 email server activation socket

[Socket]
#dovecot expects separate IPv4 and IPv6 sockets
BindIPv6Only=ipv6-only
ListenStream=0.0.0.0:143
ListenStream=[::]:143
ListenStream=0.0.0.0:993
ListenStream=[::]:993
KeepAlive=true

[Install]
WantedBy=sockets.target