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Explicitly enable IPV6_V6ONLY on the netmgr sockets

Some operating systems (OpenBSD and DragonFly BSD) don't restrict the IPv6 sockets to sending and receiving IPv6 packets only. Explicitly enable the IPV6_V6ONLY socket option on the IPv6 sockets to prevent failures from using the IPv4-mapped IPv6 address.

Closes #3093 (closed)

Edited by Ondřej Surý

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