packer: Added README and move util script to util folder.

packer/README.md

+SlapOS Image Generation with Packer
+====================================
+
+This tool repository of packer configuration files are used to generate 
+VM Ready to use for SlapOS and as well containing VM Images with slapos
+inside.
+
+How to build one VM?
+--------------------
+
+1) Install Packer locally by https://www.packer.io/downloads.html, like (exemple):
+
+::
+
+  mkdir /opt/packer/
+  cd /opt/packer/
+  wget https://releases.hashicorp.com/packer/0.10.1/packer_0.10.1_linux_amd64.zip
+  unzip packer_0.10.1_linux_amd64.zip
+
+2) Building one VM (example)::
+  
+::
+  PATH=$PATH:/opt/packer packer build debian8.json
+
+3) You can watch qemu working on a linux machine (with X running), you just 
+have to edit the json. Replace '"headless": true' by '"headless": false'
+
+How to build all VMs?
+---------------------
+
+You can use ansible for build all VMs locally, and gzip them:
+
+::
+
+  ansible-playbook build.yml -i localhost,
+
+How to upload to shacache?
+--------------------------
+
+For upload the images to shacache you can run an ansible command, however,
+you need to place your shacache keys and certificates at shacache folder, and
+eventually, update shacache/shacache.cfg.
+
+BE CAREFULL, every time you run this command you upload the files to shacache,
+even if the files are there already.
+
+::
+
+  ansible-playbook upload.yml -i localhost,
+ 
+How can I check if all images are on shacache?
+----------------------------------------------
+
+You can use the script 'util/testupload.sh' to know if all generated images 
+are uploaded to shacache.
+
+::
+
+  bash util/testupload.sh
+  # expected output similat to this
+  OK 7d3f421e75ca114abcc20b4bed6cb6fc3d430b8c016b00a1d9cb1f14af6f3c342de6a5dd3c42b52de6f49cc5800bff7879884466edba1f6fef8623bb7448832c
+  OK a0247996af937d9b1ce86cac570b98b629c05c62860c8fd88d922171c141ea6a94a1d2122ba131bdcfa712712b4674be8e332940ade7adccee55a7de7bda0d18
+
+
+How to download one image from shacache?
+----------------------------------------
+
+The images are downloaded by the SHA512SUM hash of it. Example:
+
+::
+
+  sha512sum output-centos72/packer-centos72.gz
+  a0247991d2122ba131b...BIGHASH...fa712712b4674be8e332940ade7adccee55a7de7bda0d18 output-centos72/packer-centos72.gz
+  wget http://download.shacache.org/a0247991d2122ba131b...BIGHASH...fa712712b4674be8e332940ade7adccee55a7de7bda0d18
+  # if you want a good filename use '-O centos.gz'
+  # them you can gunzip
+  gunzip centos.gz
+
+How to run locally a downloaded image?
+--------------------------------------
+
+In order to test one image (after unzip), you can run:
+
+::
+
+  bash util/quick-test IMAGE.qcow2
+  # or if you want use X and a monitor you can do:
+  bash util/quick-test packer-centos72 "-display sdl"
+
+
+Extra
+-----
+
+The automated test suite is been developed, so until now, those VMs are 
+considered unstable not recommended for production.
+

packer/quick-test

-#/bin/bash -e
-# Quick command to test the VM image with output file.
-
-/usr/bin/qemu-system-x86_64 -display sdl -drive file=$1,if=virtio,cache=writeback,discard=ignore -boot once=d -m 512M -name test -machine type=pc,accel=kvm -netdev user,id=user.0,hostfwd=tcp::3213-:22 -device virtio-net,netdev=user.0 -vnc 0.0.0.0:47

packer/util/quick-test

+#/bin/bash -e
+# Quick command to test the VM image with output file.
+
+/usr/bin/qemu-system-x86_64 $2 -drive file=$1,if=virtio,cache=writeback,discard=ignore -boot once=d -m 512M -name test -machine type=pc,accel=kvm -netdev user,id=user.0,hostfwd=tcp::3213-:22 -device virtio-net,netdev=user.0 -vnc 0.0.0.0:47