Ticket 47704 - invalid sizelimits in aci group evaluation

Bug Description:  aci group evaluation fails because of sizelimit exceeded
			but it is exceeded because it is -1476887876 or another
			negative integer becasue operation parameter are a union
			based on operation types and so for otehr than search
			the value is dependent on the operation params

Fix Description:   treat any negative integer like -1 (unlimited). A better fix
			would be to introduce a specific configuration param or
			to abondon the limit in group evaluation at all. But this
			could introduce backward compatibility problems and
			will be handled in ticket 47703 for newer versions

https://fedorahosted.org/389/ticket/47704

Reviewed by: Rich, thanks

ldap/servers/plugins/acl/acl_ext.c

@@ -881,6 +881,12 @@ acl_init_aclpb ( Slapi_PBlock *pb, Acl_PBlock *aclpb, const char *ndn, int copy_
 	slapi_pblock_get( pb, SLAPI_SEARCH_SIZELIMIT, &aclpb->aclpb_max_member_sizelimit );
 	if ( aclpb->aclpb_max_member_sizelimit == 0 ) {
 		aclpb->aclpb_max_member_sizelimit = SLAPD_DEFAULT_LOOKTHROUGHLIMIT;
+	} else if ( aclpb->aclpb_max_member_sizelimit < -1 ) {
+		/* handle the case of a negtive size limit either set or due
+		 * to bug bz1065971. The member size limit should be dropped,
+		 * but for backward compatibility to the best we can
+		 */
+		aclpb->aclpb_max_member_sizelimit = -1;
 	}
 	slapi_pblock_get( pb, SLAPI_OPERATION_TYPE, &aclpb->aclpb_optype );