this has come up several times in support
couple of frontend debugging helpers
Merge pull request #3622 from circleci/tweak-vnc-doc

tweak the vnc doc for DISPLAY issues
Merge commit '2d9e8bee82d55087f15c95be78b8754853df441c'
Merge commit '82c7c2dad40259019268487ac5eb2f64e3a08b05'