[Fuego] add support for VULS

[Bird, Timothy]

> -----Original Message-----
> From:  Daniel Sangorrin on Monday, December 25, 2017 1:22 AM
> Hi,
> 
> Please consider these patches that add support for VULS
> in Fuego. VULS is a vulnerability scanner that supports
> various Linux distributions.
> 
> [PATCH 1/2] functions: not all tests generate a log
> [PATCH 2/2] vuls: add Fuego test for the vuls vulnerability scanner
> 
> Note that the second patch was originally written by Tuyen (see author).
> I modified it to make use of the recently merged SSH_KEY
> functionality, add a few more checks, add a chart_config.json,
> and fix some minor issues.
> 
> VULS is written in GO, so I will send another patch for the
> Fuego repository with instructions to install the dependencies.

OK - this looks like a nice addition.  There's an interesting feature
with regard to specifying the DISTRO, which might be a useful
variable to have in other tests.  We'll wait and see if more uses
of this show up, but if so, maybe the variable could move from
the spec to the board file (or maybe we could bypass both of those
and add some kind of auto-detection.)

I've accepted everything, and only made changes to one patch.
But I assume this won't work without the 'go' toolchain support.
So, I'll push this master, but it will only work for you until that is
provided.

I'm not going to ACK every patch.  Instead, I'll ACK all of them here,
and only respond by e-mail to the messages that I either changed
or have issues I want to comment on.

Thanks!
 -- Tim