gpg: With --auto-key-retrieve prefer WKD over keyservers.

* g10/mainproc.c (check_sig_and_print): Print a hint on how to make
use of the preferred keyserver.  Remove keyserver lookup just by the
keyid.  Try a WKD lookup before a keyserver lookup.
--

The use of the the keyid for lookups does not make much sense anymore
since for quite some time we do have the fingerprint as part of the
signature.

GnuPG-bug-id: 4595
Signed-off-by: Werner Koch <wk@gnupg.org>

g10/keyserver.c

@@ -333,7 +333,7 @@ parse_keyserver_uri (const char *string,int require_scheme)
     {
       /* Three slashes means network path with a default host name.
          This is a hack because it does not crok all possible
-         combiantions.  We should better repalce all code bythe parser
+         combinations.  We should better replace all code by the parser
          from http.c.  */
       keyserver->path = xstrdup (uri+2);
     }