builder/amazon: Update docs on ssh_private_key

Vmware iso: Add vmx disk template path for builder

provisioner/chef-client: run cleanup on node [GH-1295]

provisioner/chef-client: chmod the directories

Merge branch 'chef-client-client_key' of https://github.com/ameir/packer into ameir-chef-client-client_key

update to most recent

make make updatedeps actually update deps

Document Amazon Block Device Mapping fields

builder/docker: support custom communicators

core: add build_name and build_type functions

builder/qemu: use proper ssh port [GH-2074]

builder/virtualbox,vmware: validate output dir in step

fix: virtualbox rename fixes overrides [GH-1828]

template: allow _ prefix to root level keys for comments [GH-2066]

provisioner/shell: escape single quotes [GH-2067]

command/fix: validate resulting template [GH-2075]