Fix AppHealthComponent tests
Fix AppHealthComponent tests

Make sure the TooltipMixin does not actually require tooltip.js which
depends on the DOM.

Kosta-Github/marathon-ui,mesosphere/marathon-ui,cribalik/marathon-ui,Kosta-Github/marathon-ui,cribalik/marathon-ui,Raffo/marathon-ui,yp-engineering/marathon-ui,quamilek/marathon-ui,watonyweng/marathon-ui,watonyweng/marathon-ui,mesosphere/marathon-ui,janisz/marathon-ui,janisz/marathon-ui,yp-engineering/marathon-ui,quamilek/marathon-ui,Raffo/marathon-ui