mkcloud: allow to call onadmin function
mkcloud: allow to call onadmin function

this allows to add new functions to qa_crowbarsetup
that can be called through mkcloud as
onadmin+funcname
or even
onadmin+func+param1+param2

vmoravec/automation,SUSE-Cloud/automation,gosipyan/automation,gosipyan/automation,aspiers/automation,vmoravec/automation,aspiers/automation,vmoravec/automation,gosipyan/automation,vmoravec/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,aspiers/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation