Add support for building QEMU images from pre-existing image files

Fixes #1334, Add power on retry to ESXi Driver.

Salt masterless tidy up

add digitalocean v2 api support

buidler/vmware-esxi: Add configuration options for the remote location to cache ISO and floppy files

#1191 - Add VMWare virtualhw.version configuration option under 'version'

builder/vmware: accept SATA drives on root VMX

builder/amazon: Extend timeout and allow user override [GH-1533]

fix quote in variable name

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>

As per the comments on the pull request It was felt that vmx hardware
version should be more explicitly documented as ‘experimental’ when
using a non default value.

Vagrantcloud selfhosted

Amazon Instance Builder Docs Still Reference Deprecated S3Endpoint

Update document about qemu builder for [GH-1407].

Fix detecting guest additions URL

provisioners/ansible-local: always use an inventory file

builder/qemu: add ability to set cache mode for disk

updated step_clone_vmx.go to work with vmx files using sata