Vendor fsouza/go-docker-client update

[notnoop]

Reprise of #7416. Thanks @greut .

Also, includes some docker vendoring tweaks to ensure that all github.com/docker/docker packages are of v19.03.8

Also fixes #6085

[tgross]

This looks like it still has Windows build issues:

==> Building pkg/windows_amd64/nomad with tags codegen_generated...
# github.com/hashicorp/nomad/vendor/github.com/docker/docker/pkg/system
vendor/github.com/docker/docker/pkg/system/filesys_windows.go:111:24: cannot use uintptr(unsafe.Pointer(&sd[0])) (type uintptr) as type *"github.com/hashicorp/nomad/vendor/golang.org/x/sys/windows".SECURITY_DESCRIPTOR in assignment
make: *** [GNUmakefile:120: pkg/windows_amd64/nomad] Error 2

and some Linux build issues:

==> Building pkg/linux_amd64/nomad with tags codegen_generated ...
vendor/github.com/docker/docker/pkg/archive/archive_linux.go:12:2: cannot find package "github.com/containerd/continuity/fs" in any of:
	/home/circleci/go/src/github.com/hashicorp/nomad/vendor/github.com/containerd/continuity/fs (vendor tree)
	/usr/local/go/src/github.com/containerd/continuity/fs (from $GOROOT)
	/home/circleci/go/src/github.com/containerd/continuity/fs (from $GOPATH)
GNUmakefile:82: recipe for target 'pkg/linux_amd64/nomad' failed

[notnoop]

@tgross sorry - I need to fix CI first before requesting review :( .

[notnoop]

This is ready for review again - all green and is passing Windows appveyor tests too

[tgross]

LGTM!

[greut]

@notnoop brilliant!

[github-actions]

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