Fix `Ipv6Addr::is_unicast_global` to check for unicast global scope#85696

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CDirkx wants to merge 3 commits intorust-lang:masterfrom CDirkx:unicast_global

+87-52

Commits on Jun 16, 2021

Change Ipv6Addr::is_unicast_global to check if an address has unicast global scope
CDirkx
committed
Rename is_unicast_global etc. to has_unicast_global_scope
CDirkx
committed
Reorder Ipv6Addr methods so has_unicast_link_local_scope and has_unicast_global_scope are together
CDirkx
committed