[JIRA] (OVIRT-1564) Refactor Jenkins check-patch

Refactor Jenkins check-patch ---------------------------- Key: OVIRT-1564 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-1564 Project: oVirt - virtualization made easy Issue Type: Task Reporter: Gil Shinar Assignee: infra Jenkins check-patch, currently, does inappropriate stuff that should be fixed: 1) it changes the local git HEAD (we shouldn't touch that) 2) it diffs the patch with the updated master instead of the latest master the patch was written on. 3) After creating a managed copy of the repo with the latest master the patch was written on, we need to rebase the upstream sources on this copy.