Built-in TCP/IP (re-)starts DNS connection on DHCP link up #3203
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scaprile
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Fixes #3160
Built-in TCP/IP now creates and manages a DNS URL when receiving a DNS IP from DHCP. Then, it tears down any DNS existing connection and creates a new one; this will fire an ARP lookup in the case of a local DNS, so that won't be necessary when issuing actual DNS queries.