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This change expands the NTP-TZ-DST example to list the active SNTP servers. It lists the IP address server name (if used) and reachability in ntpq style octal format. Tests: - Build against all LwIP stack configurations and correct operation with a single SNTP server - Vary connectivity to an SNTP server and check reachability updates - Configure 3 SNTP servers by name - With a patched LwIP stack that supports simultaneous DHCP and DHCPv6 SNTP servers check that all server details are listed and update correctly during operation