Rework `Ipv6Addr::is_global` to check for global reachability rather than global scope#86634

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CDirkx wants to merge 2 commits intorust-lang:masterfrom

CDirkx:ip-globally-reachable

Commits on Jul 8, 2021

Fix `Ipv6Addr::is_global` to check for global reachability rather than global scope
CDirkx
committed
Change `Ipv4Addr::is_global` to be in line with `Ipv6Addr::is_global`
CDirkx
committed