[Meta] Transition to Jenkins Pipeline

[vdice]

This meta tracks the tickets needed to replace existing job definitions with in-repo Jenkins Pipeline representations:

• Transition first Workflow component repo to Jenkins Pipeline: Transition first Workflow component to Jenkins Pipeline #118
• Transition remaining Workflow component repos to using Jenkins Pipeline: Transition remaining Workflow components to Jenkins Pipeline #119
• Extract common logic used in Workflow component pipelines into the Global DSL library: Extract common Pipeline logic into DSL extensions #120
• Document new Pipeline/Jenkinsfile approach and how to use in existing/new repos: Document Pipeline use #121
• Replace remaining (non-component) jobs in jenkins-jobs with Pipeline: Replace remaining Jenkins jobs with Pipeline #122

Bonus/if still warranted: Wrap up global DSL into 'official' Pipeline plugin(s)

[Cryptophobia]

This issue was moved to teamhephy/jenkins-jobs#21