Improve integration test (#859)

* CI: Added junit plugin

* Updated .gitignore

* Added integration test reporter

* Updated integration testing suite

* Updated ci config

* Updated report file path

* Use refresh 'true' instead of 'wait_for'

* Disable junit reporting

* Refresh one single time

* Update security index name

* Updated skip test handling and use class syntax

* Updated test script

* Disable test timeout

* Added command to automatically remove an old snapshot

* Disable timeout in integration test script

* Updated logs and cleaned up git handling

* Fixed shouldSkip utility

* Updated cleanup code

* Updated cleanup code pt 2

* Rename Platinum to XPack

scripts/es-docker.sh

@@ -4,6 +4,11 @@
 # to delete an old image and download again
 # the latest snapshot.
 
+# pass `--clean` to reemove the old snapshot
+if [ "$1" != "" ]; then
+  docker rmi $(docker images --format '{{.Repository}}:{{.Tag}}' | grep '8.0.0-SNAPSHOT')
+fi
+
 exec docker run \
   --rm \
   -e "node.attr.testattr=test" \