Release v5.0.0

This release introduces major changes to the way Mixer is called and
run. Previously, mixer gained support for automatically building format
bumps, but was disabled by default (with --native=true always turned
on). The flag forces mixer to run natively on the system, and not
perform format bump builds automatically. With this release, the default
becomes --native=false, meaning all mixer 'build' commands will run in a
docker container. Running in a container ensures the proper version of
the tooling is run for specific build versions, because one version of
tooling cannot build for 2 different formats.

Mixer will automatically pull the appoproriate container that can create
builds for a given format, so the format bump process can truly be
automated and correct. It will still use a container for regular,
non-format bump builds for consistency.

Note that aside from the initial docker pull,
creating a mix will not be any slower than running natively, and allows
users to build versions that require tooling outside of their
host system version.

Another significant change involves the configuration for Mixer. The
builder.conf is now updated to be a stable, relatively unchanging
config to describe your workspace. The stateful items (versions, format,
etc) are moved into a mixer.state file which holds ephemeral values that
are changed build-to-build. This keeps all stateless and stateful items
centralized and follows a single format (TOML). The new format is used
by default, but can be overridden by setting --new-config=false during
the init phase. Both configs are versioned so mixer can easily detect
format changes and config errors.

Signed-off-by: Tudor Marcu <tudor.marcu@intel.com>

builder/builder.go

@@ -45,7 +45,7 @@ import (
 )
 
 // Version of Mixer. Also used by the Makefile for releases.
-const Version = "4.7.0"
+const Version = "5.0.0"
 
 // Native controls whether mixer runs the command on the native machine or in a
 // container.