killprocs: add kill_delay setting

This allows containers using OpenRC based services to be configured to
allow open tcp connections to be closed before they are shut down.

This fixes #476.

conf.d/killprocs

@@ -4,3 +4,8 @@
 # The setting is called killall5_opts because the options here are meant
 # to be identical to those you could pass to killall5.
 killall5_opts=""
+
+# If you need to delay after each kill attempt during shutdown, set the amount
+# of time you need to delay here. This gets passed directly to sleep in
+# the shell.
+# kill_delay=0

init.d/killprocs.in

@@ -20,8 +20,10 @@ start()
 {
 	ebegin "Terminating remaining processes"
 	kill_all 15 ${killall5_opts}
+	sleep ${kill_delay:-0}
 	eend 0
 	ebegin "Killing remaining processes"
+	sleep ${kill_delay:-0}
 	kill_all 9 ${killall5_opts}
 	eend 0
 }

z

@@ -0,0 +1,27 @@
+diff --git a/conf.d/killprocs b/conf.d/killprocs
+index 76a2bc9c..1c93b89d 100644
+--- a/conf.d/killprocs
++++ b/conf.d/killprocs
+@@ -4,3 +4,7 @@
+ # The setting is called killall5_opts because the options here are meant
+ # to be identical to those you could pass to killall5.
+ killall5_opts=""
++
++# If you need to call sleep after each kill attempt during shutdown, set
++# the amount of time you need to sleep here.
++# sleep_time=0
+diff --git a/init.d/killprocs.in b/init.d/killprocs.in
+index fcf1364d..7b96a7a7 100644
+--- a/init.d/killprocs.in
++++ b/init.d/killprocs.in
+@@ -20,8 +20,10 @@ start()
+ {
+ 	ebegin "Terminating remaining processes"
+ 	kill_all 15 ${killall5_opts}
++	sleep ${sleep_time:-0}
+ 	eend 0
+ 	ebegin "Killing remaining processes"
++	sleep ${sleep_time:-0}
+ 	kill_all 9 ${killall5_opts}
+ 	eend 0
+ }