ACUMOS: Improve jenkins jobs for Acumos projects

- Mirror branches from Acumos upstream project to Nordix.
- Do not force the git user.name to be the gerrit id.
  Git authorship can be independent from the
  gerrit review ownership now.
- Cache the repository on the Jenkins slave nodes
  when rebasing repositories.
- Make sure the commit hash in the local repo is the same
  as in nordix Gerrit and the same as the commit hash
  in the upstream gerrit.
- Decrease number of jobs required for project in Jenkins

Change-Id: I29ea8b9b2573b5d894246f47b537aeb61027f6f8
diff --git a/jjb/acumos/rebase-jobs.sh b/jjb/acumos/rebase-jobs.sh
new file mode 100755
index 0000000..41c2aa3
--- /dev/null
+++ b/jjb/acumos/rebase-jobs.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+set -o errexit
+set -o nounset
+set -o pipefail
+
+cd $WORKSPACE
+# Make sure the Nordix is set from Jenkins Job configuration
+# parameter: NORDIX_REMOTE and not from previous job execution
+if git remote | grep nordix > /dev/null ; then
+    git remote rm nordix
+fi
+# When the GERRIT_BRANCH is not set the rebase job wasn't triggered by merge
+# but it's executed as part of timer. In this case we will make sure that all
+# branches from remote are synced with Nordix Gerrit.
+if [[ -z "${GERRIT_BRANCH:-}" ]] ; then
+    echo "-- Fetch all branches from Acumos for project: ${PROJECT} --"
+    REMOTE_BRANCHES=$(git branch -r | grep -v 'HEAD -> ' | awk '/origin/ {gsub("origin/","");print}')
+    for branch in ${REMOTE_BRANCHES}  ; do
+        git branch -f --track ${branch} origin/${branch}
+    done
+# The job was triggered by merge on Acumos. We will make sure that branch set
+# in GERRIT_BRANCH is in sync with Nordix Gerrit.
+else
+    echo "-- Fetch branch: ${GERRIT_BRANCH} from Acumos for project: ${PROJECT} --"
+    REMOTE_BRANCHES=${GERRIT_BRANCH}
+    git branch -f --track ${GERRIT_BRANCH} origin/${GERRIT_BRANCH}
+fi
+git fetch origin -v
+echo "-- Adding new remote $NORDIX_REMOTE for sync --"
+git remote add nordix $NORDIX_REMOTE
+git remote -v
+echo "-- Merging changes from Acumos remote branches to local branch: --"
+for branch in ${REMOTE_BRANCHES}  ; do
+    echo "------ Branch name: ${branch}"
+    git checkout ${branch} -q
+    git merge origin/${branch} --ff-only --stat
+done
+echo "-- Pushing changes to Nordix Gerrit --"
+git push nordix --all -v
+echo "--------------------------------------------------------------------"