dirmngr: Fallback to CRL if no default OCSP responder is configured.
* dirmngr/server.c (cmd_isvalid): Use option second arg to trigger OCSP checkibng. Fallback to CRL if no default OCSP responder has been configured. * sm/call-dirmngr.c (gpgsm_dirmngr_isvalid): Adjust accordingly.
- Signed-off-by: Werner Koch <wk@gnupg.org>