issue with db_module_dir parameter

[Will Fiveash]

I'm concerned about how db_module_dir is read.  I expect that
db_module_dir will be read in the DB2 entry in the [dbmodules] section
below but that does not appear to be the case.  If I move the
db_module_dir outside the DB2 entry so it is global to the [dbmodules]
section then it is read (see kdb_load_library() in src/lib/kdb/kdb5.c).
This does not appear to be correct behavior as it prevents the KDB
plugins from specifying unique locations for particular plugins.
Thoughts?

[libdefaults]
    default_realm = ACME.COM

[realms]
    ACME.COM = {
        kdc = kdc.foo.acme.com
        admin_server = kdc.foo.acme.com
        database_module = DB2
    }

[domain_realm]
    .acme.com = ACME.COM

[dbmodules]
    DB2 = {
        db_module_dir = /usr/local/krb_ldap/lib/krb5/plugins/kdb
        dbname = db2
    }
-- 
Will Fiveash
Sun Microsystems Inc.
Austin, TX, USA (TZ=CST6CDT)