fs: retry "network is unreachable" and "network is down" errors

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ENETUNREACH and ENETDOWN were not in the list of retriable errors on
non-Windows platforms, so a single failed connection aborted the
transfer instead of being retried as a low level retry. The Windows
list already includes the equivalent WSAENETUNREACH and WSAENETDOWN.

This is easy to hit on a host with IPv6 enabled but no IPv6 route: if
the A lookup fails transiently while the AAAA lookup succeeds, the only
address to dial is IPv6 and the connect fails with ENETUNREACH. A retry
resolves again and normally succeeds.

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500 Internal Server Error

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