[Jenkins-infra] JIRA upgrade to 6.4.2

[Kohsuke Kawaguchi]

The migration of JIRA from eggplant to a container in edamame went smoothly
yesterday.

As a next step, I worked on the preparation of upgrading JIRA from the
current 5.0.6 to the latest 6.4.2.

Thanks to the containerization, I was able to test this locally with a
clone of production data. I've captured obstacles and remedies that I came
across in this note
<https://github.com/jenkins-infra/jira/blob/master/UPGRADE.md>. Your sanity
check would be appreciated.

I've requested OSUOSL to give us more disk space. edamame doesn't have
enough disk space to pull the new JIRA container, so my current plan is to
wait for the disk space to be expanded, which hopefully happen this week,
then perform this upgrade in the next Saturday.

-- 
Kohsuke Kawaguchi
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