Jon Atack 29f2cbdeb7
cli: extract connection exception handler, -rpcwait logic
to ConnectAndCallRPC() to be callable for individual connections.

This is needed for RPCs that need to be called and handled sequentially, rather
than alone or in a batch.

For example, when fetching the balances for each loaded wallet, -getinfo will
call RPC listwallets, and then, depending on the result, RPC getbalances.

It may be somewhat helpful to review this commit with `git show -w`.
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