COOK-3243 - Expose LSB init directory as a configurable

The Opscode Engineering team has begun using this cookbook for configuring embedded services in Omnibus packages for server projects. One issue we hit is all LSB init scripts are created at the system-wide location (`/etc/init.d`) vs the Omnibus embedded location (`/opt/PROJECT/init`). This PR makes the currently hard-coded LSB init directory a configurable.