Update Model.supporting(feature) to check instances
Update Model.supporting(feature) to check instances

The `Model.supporting(feature)` method currently only checks class-level
supports and ignores the instance level.

ManageIQ/manageiq,kbrock/manageiq,kbrock/manageiq,jrafanie/manageiq,kbrock/manageiq,agrare/manageiq,mzazrivec/manageiq,ManageIQ/manageiq,mzazrivec/manageiq,jrafanie/manageiq,agrare/manageiq,ManageIQ/manageiq,jrafanie/manageiq,kbrock/manageiq,agrare/manageiq,jrafanie/manageiq,ManageIQ/manageiq,mzazrivec/manageiq,agrare/manageiq,mzazrivec/manageiq