Fix healthcheck failing in dual stack network when resolving hostname #231
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In dual stack networks, `getent` may return an ipv6 address when resolving a hostname, causing healthchecks to fail in the `is_tcp_connection_established()` function. This change ensure ip returned by `getent` in `get_ip()` function is a ipv4 address, if not, then try resolving hostname with `s6-dnsipv4` instead.
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In dual stack networks,
getentmay return an IPv6 address when resolving a hostname, causing healthchecks to fail in theis_tcp_connection_established()function. This change ensures that the IP address returned bygetentin theget_ip()function is an IPv4 address, and if not then try resolving the hostname withs6-dnsipv4instead.