Use objectclass LDAProotDSE for root DSE instead of LDAPsubentry.

Still need object classes for both of these.  Suspect we'll need
to assign "experimental" ones from our arc.

servers/slapd/root_dse.c

@@ -105,8 +105,8 @@ root_dse_info( Connection *conn, Operation *op, char **attrs, int attrsonly )
 	val.bv_len = sizeof("top")-1;
 	attr_merge( e, "objectClass", vals );
 
-	val.bv_val = "LDAPsubentry";
-	val.bv_len = sizeof("LDAPsubentry")-1;
+	val.bv_val = "LDAProotDSE";
+	val.bv_len = sizeof("LDAProotDSE")-1;
 	attr_merge( e, "objectClass", vals );
 
 	val.bv_val = "extensibleObject";

servers/slapd/schema/core.schema

@@ -480,3 +480,10 @@ objectclass ( 2.16.840.1.113730.3.2.6 NAME 'referral'
 objectclass ( LDAPsubEntryOID NAME 'LDAPsubEntry'
 	DESC 'Limited X.501 Subentry class, named by cn'
 	SUP top STRUCTURAL MUST ( cn ) )
+
+#
+# LDAProotDSE
+#
+objectclass ( LDAProotDSEOID NAME 'LDAProotDSE'
+	DESC 'Root DSE object class'
+	SUP top STRUCTURAL )