Updated usher to create host keys if needed, added dependencies and

also cleaned up Makefile

SNAP/usher

@@ -24,7 +24,11 @@ case $1 in
       fi
     fi
 
-    chown -v root:root /var/run/sshd
+    chown root:root /var/run/sshd
+
+    if [ ! -f /etc/ssh/ssh_host_rsa_key ]; then
+      ssh-keygen -A
+    fi
     ;;
   prerm)
     exit 0