Remove table_id in flow from config namespace

table_id in Flow should not be visible in config namespace. It then enables users to create incorrect Flow configuration which has different table_id specified in payload than one specified in path e.g.

path:
.../config/opendaylight-inventory:nodes/node/openflow:1/table/0/flow/1234

data:
<flow xmlns="urn:opendaylight:flow:inventory">
<id>1234</id>
...
<priority>2</priority>
<strict>false</strict>
<table_id>2</table_id>
</flow>