Ensure privilege separation exists

src/freedombone-utils-ssh

         echo "KexAlgorithms $SSH_KEX" >> /etc/ssh/sshd_config
     fi
     sed -i "s|#KexAlgorithms $SSH_KEX|KexAlgorithms $SSH_KEX|g" /etc/ssh/sshd_config
+    if ! grep -q 'UsePrivilegeSeparation' /etc/ssh/sshd_config; then
+        echo 'UsePrivilegeSeparation sandbox' >> /etc/ssh/sshd_config
+    fi
     sed -i 's|#UsePrivilegeSeparation .*|UsePrivilegeSeparation sandbox|g' /etc/ssh/sshd_config
     sed -i 's|UsePrivilegeSeparation .*|UsePrivilegeSeparation sandbox|g' /etc/ssh/sshd_config