Fix resume issues [JENKINS-49686] and [JENKINS-50199] and [JENKINS-50407]#93

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svanoort merged 17 commits intojenkinsci:masterfrom

svanoort:fix-resume-issues

Apr 8, 2018

Commits on Mar 22, 2018

Make completed persistent and use a guard object for synchronization instead
svanoort
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Remove redundant save operations from graphListener if durability setting permits
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Commits on Mar 27, 2018

Commits on Mar 29, 2018

Prevent NPEs around listener use by switching to an intializing getter
svanoort
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Commits on Mar 30, 2018

Typo
svanoort
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Commits on Apr 3, 2018

Commits on Apr 4, 2018

Commits on Apr 6, 2018