Added init.d script compliant with rc-system. It supports multiple
instances of the service.
By default it looks for /etc/cntlm.conf file. You can define a new
service instance by creating a link to init.d script:
ln -s /etc/init.d/cntlm /etc/init.d/cntlm.<instance_name>
and by creating a new config file in /etc/cntlm.d/<instance_name>.conf
