Related to bnc#886599 and others. That is use the vhangup(8) tool
to explicit do a virtually hangup on the specified on the terminal
line to give e.g. the bash a few seconds to e.g. safe its history.

---
 units/getty@.service.m4        |    1 +
 units/serial-getty@.service.m4 |    1 +
 2 files changed, 2 insertions(+)
--- units/getty@.service.m4
+++ units/getty@.service.m4	2014-07-15 07:30:28.006235859 +0000
@@ -29,6 +29,7 @@ ConditionPathExists=/dev/tty0
 [Service]
 # the VT is cleared by TTYVTDisallocate
 ExecStart=-/sbin/agetty --noclear %I $TERM
+ExecStopPost=-/sbin/vhangup /dev/%I
 Type=idle
 Restart=always
 RestartSec=0
--- units/serial-getty@.service.m4
+++ units/serial-getty@.service.m4	2014-07-15 07:30:01.366235017 +0000
@@ -24,6 +24,7 @@ IgnoreOnIsolate=yes
 
 [Service]
 ExecStart=-/sbin/agetty --keep-baud %I 115200,38400,9600 $TERM
+ExecStopPost=-/sbin/vhangup /dev/%I
 Type=idle
 Restart=always
 RestartSec=0