update image at runtime in case it does not have the latest mesos lib…

[skonto]

• update image at runtime in case it does not have the latest mesos lib…
• warn user for compatibility issues between host and image versions The initial intention was to fix compatibility issues but even if we build docker image regularly when a new version of mesos is out we will face this issue here (docker when run does not pull the latest by default!!!): https://github.com/docker/docker/issues/13331

Another option something like that? https://github.com/glowdigitalmedia/docker-puller

Another option is to remove mesos completely from image build, but this does not solve the problem if we choose another base image like a future ubuntu version and end users use a different one due to the docker issue. There might be issues there. Also that means slowing-down installation (it takes around 40 secs per container to install mesos internally).

[skonto]

i will rebase

[skonto]

this is needed in order to upgrade image and jenkins instance next.

[skonto]

changed the returned value...

[skonto]

fix the quote thing i thought i have covered that because it also failed when testing it with custom config and spaces...

[skonto]

ok i think now its working...

[skyluc]

Spacing can be fixed later. LGTM.