[OE-core] [PATCH] cve-update-db: Use std library instead of urllib3

[Pierre Le Magourou]

Hi,

> > On 07/02/2019 03:39 PM, ChenQi wrote:
> > > A recent do_populate_cve_db failure:
> > > https://autobuilder.yoctoproject.org/typhoon/#/builders/23/builds/1005/steps/7/logs/errors
> > >
> > >
> > > Could you please help look at what's going on?
> On Tue, 2019-07-02 at 16:08 +0800, ChenQi wrote:
> > I just tired to open the web but failed. The web seems down.
> >
>
> We were making some changes to the autobuilder to speed it up (changing
> database backends), its back now.
>

The NVD website is down, cve-update-db should not fail in that case. I
need to update it, so it prints a warning instead.
I am also wondering if we should mirror NVD json data feeds, to avoid
too many requests from Yocto users. (but I don't know how to do that)

Pierre