Disable startup by default after package installation

Hi there,

Happy new year first.

This patch add envar used by init.d script to prevent from starting by default.
Often before you have to work on config files to fit your needs (manually or with provisioning tool like chef or puppet) and then only start the service.
This can be used also for tier programs that depends on ES libs but does not need for the service running on the same host.

Cheers,