add docs for lxc runner
Merge pull request #10065 from gravyboat/develop

Updated the hacking doc to add a note about jenkins, and trash the travis-ci note.
Added a rST anchor for the Reactor docs
add lxc runner to index.rxt
Merge pull request #10057 from mgwilliams/lxc

add docs for lxc runner
first working draft of a best practices document.