Inline shell commands should be more human readable

[purpleidea]

If hashicorp/vagrant#5607 is merged, this patch becomes a lot simpler.
If not, I suppose we could add a bunch of echo blah blah blah, to the top of each inline script, but that would be an ugly, ugly hack.
This is an easy patch, assuming the above is merged.
Unfortunately it would force a new version of vagrant on users.
So let's do this, but only once the above patch is in the current Fedora.
If we can make it detect the vagrant version and react accordingly, that's okay for now :)

[purpleidea]

Sweet! This got merged, so we can start adding patches to shell provisioners to support this. I'm going to wait until a version of vagrant with this feature lands in Fedora, but if someone would like to submit them to an early feature branch, this should be an easy patch :)