rpc, cli: add network in/out connections to getnetworkinfo and -getinfo

Summary:

Add in/out connections to rpc getnetworkinfo

UNIX_EPOCH_TIME fixup in rpc getnettotals

Add in/out connections to cli -getinfo

This is a backport of core#19405

Test Plan: ninja check-functional

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10180