+pro backported github-tagging (jenkins utility) to 2.3 branch

scripts/build/github-tagging.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# tag an github issue with the given tag, api token is taken from env ($PR_VALIDATOR_GH_TOKEN)
+# usage: ghtag ISSUE_NR OWNER REPO ADD_TAGS RM_TAGS
+#
+# ADD_TAGS should be json with tokens you want to add, as in: ["tested"]
+# RM_TAGS should be a list of words, like "building bananas"
+function ghtag {
+  if [[ "$PR_VALIDATOR_GH_TOKEN" == "" ]]
+  then
+    echoerr "Env variable PR_VALIDATOR_GH_TOKEN was empty, unable to call github api!"
+    exit 1;
+  fi
+
+  issue=$1
+  owner=$2
+  repo=$3
+  add=$4
+  remove=$5
+
+  curl -s -H "Authorization: token $PR_VALIDATOR_GH_TOKEN" https://api.github.com/repos/$owner/$repo/issues/$issue/labels -X POST -d $add > /dev/null
+  for d in $remove
+  do
+    curl -s -H "Authorization: token $PR_VALIDATOR_GH_TOKEN" https://api.github.com/repos/$owner/$repo/issues/$issue/labels/$d -X DELETE > /dev/null
+  done
+}
+
+echoerr() { echo "$@" 1>&2; }