De-duplicate validation methods inside of the linter
De-duplicate validation methods inside of the linter

Validation hook runners were essentially the same except by whom they
were targetting.

Ashton-W/Core,dacaiguoguogmail/Core,gabro/Core,k0nserv/Core,dnkoutso/Core,AdamCampbell/Core,CocoaPods/Core,brianmichel/Core