Add option to skip package download, remove lsb dependencies from init script

Hi, just tried your module.  Seems to work well but I didn't want to download directly and instead store the packages on an internal fileshare.

It should have been a separate pull request but I've also updated the init script to remove lsb dependencies, based on https://answers.atlassian.com/questions/218946/stash-system-v-init-script-for-rhel.