Check for parallels instead of docker

[tomjn]

So it turns out if you do:

`command goes here`

And the command doesn't exist, then it will generate a syntax error rather than reporting a failure.

It also turns out that if we use system() to bypass this it works but the output is dumped into the terminal and the only way to avoid it is to pipe to dev/null which isn't an option on Windows.

So instead we ask vagrant if parallels is installed

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[update-docs]

Thanks for opening this pull request! Make sure CHANGELOG.md gets updated with this change, additionally any docs that need updated can be found at https://github.com/Varying-Vagrant-Vagrants/varyingvagrantvagrants.org

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