Upgrade libmachine to master

[afbjorklund]

This includes the fixes that was previously on
the github.com/machine-drivers/machine master:

6f34be4 Allow localized names for Virtual Switch (now docker/machine@5bc065d)
3a0d935 Fix broken IsVTXDisabled detection on AMD CPU (now docker/machine@173a41d)

$ git diff --stat v0.16.1 v0.16.1^-24-ga555e4f7a8f5
 MAINTAINERS                           | 13 +++++--------
 drivers/amazonec2/amazonec2.go        | 26 +++++++++++++++++++++-----
 drivers/amazonec2/region.go           |  1 +
 drivers/google/compute_util.go        |  2 +-
 drivers/google/google.go              | 44 +++++++++++++++++++++++++++-----------------
 drivers/hyperv/hyperv.go              |  4 ++--
 drivers/openstack/client.go           |  1 +
 drivers/openstack/openstack.go        | 24 ++++++++++++++++++++++++
 drivers/softlayer/softlayer.go        |  1 -
 drivers/virtualbox/vtx_intel.go       |  2 +-
 drivers/vmwarefusion/fusion_darwin.go |  2 +-
 libmachine/provision/arch.go          |  2 +-
 libmachine/provision/arch_test.go     |  4 ++--
 version/version.go                    |  2 +-
 14 files changed, 88 insertions(+), 40 deletions(-)

Unfortunately machine does not tag on master...

Hacked the go.mod, to make it less weird (v0.7.1?)

Closes #4816

[k8s-ci-robot]

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[medyagh]

Registry fail tests are related to : #4820

[tstromberg]

@minikube-bot OK to test

[medyagh]

/retest this please

[medyagh]

/retest this please