copy dovecot cert to client

src/freedombone-clientcert

 # move the cert to the user's home
 mkdir /home/$USERNAME/emailcert
 mv /etc/ssl/certs/$USERNAME.cer /home/$USERNAME/emailcert
+cp /etc/ssl/certs/dovecot.crt /home/$USERNAME/emailcert
 cp /etc/ssl/certs/ca-$HOSTNAME.crt /home/$USERNAME/emailcert
 mv /etc/ssl/private/$USERNAME.key /home/$USERNAME/emailcert
 mv /etc/ssl/certs/$USERNAME.crt /home/$USERNAME/emailcert