Adds retry mechanism to applyNullSafe method#204

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jlcontreras wants to merge 3 commits intojenkinsci:masterfrom

jlcontreras:retry

Commits on Jan 4, 2019

Added retry/backoff to GitHubRepositoryName.resolve method for robustness
Jose Luis Contreras
committed

Commits on Jan 25, 2019

Moved retry mechanism to the applyNullSafe method
Jose Luis Contreras
committed

Commits on Jan 28, 2019

Style fixes, updated findbugs-maven-plugin to v3.0.5 to work with maven 3.6
Jose Luis Contreras
committed