MacOS can't specify accellerator as hvf

[niko-dunixi]

Versions:

• Vagrant 2.2.18

Steps to reproduce

Expected behaviour

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Actual behaviour

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System configuration

OS/Distro version::

Libvirt version:

Output of vagrant version; vagrant plugin list:

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A Vagrantfile to reproduce the issue:

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Are you using upstream vagrant package or your distros package?
Upstream / Distro