dirmngr: Extend the AD_QUERY command.
* dirmngr/server.c (cmd_ad_query): Add options --help and --subst. (cmd_getinfo): Add sub-command "sid". * dirmngr/ks-engine.h (KS_GET_FLAG_SUBST): New. * dirmngr/ks-engine-ldap.c (ks_ldap_help_variables): New. (getval_for_filter): New. (map_rid_to_dn): New. (ks_ldap_query): Support variables.
The new variables features makes it easier to write AD queries without
requiring domain specific expressions.