Make sure SSH host keys are generated when SSH is enabled

debian/changelog

@@ -2,6 +2,7 @@ raspi-config (20190429) buster; urgency=medium
 
   * Update do_wifi_country
     - Enable wifi regardless of whether /run/wifi-country-unset exists
+  * Make sure SSH host keys are generated when SSH is enabled
  -- Serge Schneider <serge@raspberrypi.org>  Mon, 29 Apr 2019 14:52:56 +0100
 
 raspi-config (20190424) stretch; urgency=medium

raspi-config

@@ -676,6 +676,7 @@ do_ssh() {
     RET=$1
   fi
   if [ $RET -eq 0 ]; then
+    ssh-keygen -A &&
     update-rc.d ssh enable &&
     invoke-rc.d ssh start &&
     STATUS=enabled