Once we have produced a qemu VM, we now have the option of using
the vagrant post-processor to create a .box file that can be used with
the vagrant-libvirt plugin.

This uses the new State method of the Artifact API to get necessary
information from the builder.

In order that something consuming an artifact can have access to extra
builder specific data add the State method which allows the caller to
ask for arbitary values by name.

By default codec's MessagePack encode/decode will convert a string
into a []byte.  Tweak the settings so that string -> string and []byte
-> []byte.

builder/vmware-esx: Ignore localhost for VNC lookup and document VNC requirements [GH-1480]

  Adds logic to ESXi driver VNC Address function to ignore listen
  addresses that bind to localhost (127.0.0.1), this allows certain
  default ports to be available on ESXi for VNC connections

fixed vmware-vmx step order

Run two builds in parallel with go get

By default, go get determines parallelism based on the number of
cores available. Those show up as 32 in the Travis CI environment
but a virtual machine is limited both by the amount of cores it
has allocated and the amount of memory available to it. 32 parallel
build processes are likely to exhaust the memory resources, leading
to killed processes.

This change reduces the number of builds running concurrently to 2,
which should reduce the likelihood of memory exhaustion greatly.

The number could probably be dialed up a little bit, but this should
give a good default reflecting the environment's resources.

website: Add group_vars and host_vars to Ansible provisioner docs

(configs to disable will come next)

Config Dir and plugin discovery there