RPC: get_info recommendations

[neuroscr]

( add last sent uptime proof and last network received uptime proof OR alternatively move last_lokinet_ping & last_storage_server_ping to get_service_node_status ) I'm thinking this maybe because my test case isn't staked. I will test on a staked node later and update

Other suggestions:

• remove update_available
• combine mainnet/stagenet/testnet into network since you can only ever be on one of those