[PATCH v3 GnuPG] allow import without user ids

[Vincent Breitmoser]

> As remarked over at the WG list I am not convinced of that whole change.

I interpreted your reply "useful feature request" and triage as normal on T4393
as agreement that this is generally a desirable feature?

If you are only unhappy with the method of the patch, please give some specifics
and I will try to fix them.

> The patches I have seen are pretty intrusive and change long standing
> behaviour of gpg.

Note that this patch changes behavior mostly in a way that was already
achievable before through the use of "import-drop-uids".

 - V