qa_crowbarsetup/IPMI: fix powering off extra nodes
qa_crowbarsetup/IPMI: fix powering off extra nodes

Currently errors like this:
+ '[' -gt 3 ']'
qa_crowbarsetup.sh: line 1765: [: -gt: unary operator expected

because in commit e52046a5b we moved $i into another place

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