This change is slightly breaking for existing hystrixCommand code since the resource name changes from run->execute and getFallback->fallback. The fallback span is also now a child of the execute span.
It turns out that Eclipse's OSGi implementation has two problems:
* It doesn't respect system properties by default
* It has tricky classloader implementation that loads bootstrap
classes from the classloader-has-delegation-to-bootstrap check but
doesn't load bootstrap classes from 'normal' code.
This should address second problem and make Eclipse's OSGi
implementation 'safe' by default.