Import from jenkins-scripts
Towards travis-style CI

Move scripts closer to the stuff they script,
in preparation for a more travis-like CI set up.
Moved from scala/jenkins-scripts, see also scala-jenkins-infra.

Introduced `sshCharaArgs`, must turn it into an array using `declare -a`
Merge pull request #143 from adriaanm/2.11.x

2.11.x