Sleep less

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
Sleep less - improve responsiveness user experience

Additional description (if needed):
Lower amount of time we sleep() in some exit/quit situations.
I would favor to remove all such sleeps ;)
But because of historical reasons, lets just lower the amount here.
I checked ircii, irssi and weechat and there is no single sleep in them longer than 2 secs.
mirc removed any sleep a long time ago: https://forums.mirc.com/ubbthreads.php/topics/251851/exit-and-quit-message
Also i argue: why do we sleep in some situations, when in others we dont need to, like .jump does not sleep:

.jump 127.0.0.1
18:04:33.309994 write(8, "QUIT :changing servers\n", 23) = 23
18:04:33.310534 close(8)                = 0

Test cases demonstrating functionality (if applicable):
2 sleeps were modified, so i checked both situations:

1. /msg <bot> die <passwd>
2. kill <pid_of_bot>