Added the openssh post_install keygen script.

Applied with the following Haiku:

Openssh
Uses this bash post install
Script to make the keys

net-misc/openssh/boot/post_install/ssh.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# generate SSH host keys
+
+ETCSSHDIR=`finddir B_COMMON_ETC_DIRECTORY`/ssh
+mkdir -p ${ETCSSHDIR}
+
+hostKeyDir=${ETCSSHDIR}
+
+if [ ! -f "$hostKeyDir/ssh_host_key" ] ; then
+	ssh-keygen -t rsa1 -f "$hostKeyDir/ssh_host_key" -N ""
+fi
+
+if [ ! -f "$hostKeyDir/ssh_host_dsa_key" ] ; then
+	ssh-keygen -t dsa -f "$hostKeyDir/ssh_host_dsa_key" -N ""
+fi
+
+if [ ! -f "$hostKeyDir/ssh_host_rsa_key" ] ; then
+	ssh-keygen -t rsa -f "$hostKeyDir/ssh_host_rsa_key" -N ""
+fi