test with multiple different versions of go

[jodh-intel]

virtcontainers is currently tested against 3 different versions of go under TravisCI: 1.7, 1.8 and "tip". As we're going to switch off TravisCI for virtcontainers, we should consider testing the repos that use Jenkins with different versions of golang.

Currently, we're testing with go 1.8.3:

• https://github.com/clearcontainers/jenkins/blob/master/config.xml#L110..L111

If we just want to stick with a single version, we might want to think about 1.9.2 which is the latest stable release:

• https://golang.org/dl/