Add packer scripts for vagrant image generation

Change-Id: If163c456b756f6c7c8a7a197dabc8eb3b1fc7907
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>
diff --git a/packer/.gitignore b/packer/.gitignore
new file mode 100644
index 0000000..7979d3a
--- /dev/null
+++ b/packer/.gitignore
@@ -0,0 +1,3 @@
+output-virtualbox-iso/
+packer_cache/
+builds/