uboot/kernel: Only send mail on failed builds
As I learned today mails from Jenkins were so far held by list moderation. Now that they flow in it'd be nice to only have them when a build fails. E.g. like:
https://stackoverflow.com/questions/39720225/send-email-on-jenkins-pipeline-failure
@angus.ainslie since this affects kernel and uboot could you have a look (since I'm on my way back from GUADEC)
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