Docker mod for openssh-server

This mod adds rsync to openssh-server, to be installed/updated during container start.

In openssh-server docker arguments, set an environment variable DOCKER_MODS=linuxserver/mods:openssh-server-rsync

Mod creation instructions

• Ask the team to create a new branch named <baseimagename>-<modname>. Baseimage should be the name of the image the mod will be applied to. The new branch will be based on the template branch.
• Fork the repo, checkout the template branch.
• Edit the Dockerfile for the mod. Dockerfile.complex is only an example and included for reference; it should be deleted when done.
• Inspect the root folder contents. Edit, add and remove as necessary.
• Edit this readme with pertinent info, delete thse instructions.
• Finally edit the travis.yml. Customize the build branch,and the vars for BASEIMAGE and MODNAME
• Submit PR against the branch created by the team