Add ability to reuse existing build hosts backed by EC2#442

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troymohl wants to merge 5 commits intojenkinsci:masterfrom troymohl:stop-start-ec2

+749-12

Commits on Mar 16, 2020

Commits on Mar 18, 2020

prevent_stop tag presence and true, prevents stopping instance
troymohl
committed

Commits on Mar 26, 2020

Fix bug where label expressions weren't correctly handled
troymohl
committed