conf: Introduce P11_KIT_NO_USER_CONFIG

Currently `ca-certificates.spec` in Fedora ends up doing in `%post`:
```
/usr/bin/p11-kit extract --format=openssl-bundle --filter=certificates --overwrite --comment $DEST/openssl/ca-bundle.trust.crt
```
etc.

And due to this bit of code in p11-kit, we end up looking for the home
directory for configuration.  In this case, `/root`.

It's categorically wrong to do this; the root user is distinct from
"the system".  This issue is equivalent to one I fixed in Pango:
https://git.gnome.org/browse/pango/commit/?id=aecbe27c1b08f517c0e05f03308d3ac55cef490c

Fast forward to today, and the reason I'm making this change is I'm working on
`rpm-ostree ex container`, which builds containers as *non-root* (like
gnome-continuous does, but now with RPMs), keeping the invoking uid. And this
bug causes the `ca-certificates` `%post` to fail because it's trying to look for
my uid 1000 which doesn't exist in the target rootfs' password database.

Again, there's no reason to be looking for a home directory for system triggers,
regadless of UID, so once this patch lands, I'll update `ca-certificates` to use
it, and traditional RPM `%post` will stop looking in `/root` too.

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