Add 'packer-image-create' job

- add packer-image-create.groovy to create images with packer
- add 'tcp_tests/templates/_packer/' with configs for 'foundation'
  node

Change-Id: I23379bef389adad791df9343930095a57af3fb55
diff --git a/tcp_tests/templates/_packer/scripts/zerodisk.sh b/tcp_tests/templates/_packer/scripts/zerodisk.sh
new file mode 100644
index 0000000..159ae13
--- /dev/null
+++ b/tcp_tests/templates/_packer/scripts/zerodisk.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+set -x
+
+dd if=/dev/zero of=/EMPTY bs=1M || true
+rm -f /EMPTY
+
+sync
+echo 3 > /proc/sys/vm/drop_caches