traceroute: remove gethostby*() calls

[yanhaowang]

Summary

1. Use "getaddrinfo" and "getnameinfo" function to replace "gethostbyname".
2. Use "getnameinfo" to replace "gethostbyaddr" function.

Test Plan

Use traceroute www.google.com to check if the revised code output same as before.

// Origin
kola@freebsd:/usr/src/usr.sbin/traceroute $ traceroute www.google.com
traceroute: Warning: www.google.com has multiple addresses; using 142.251.42.228
traceroute to tsa01s11-in-f4.1e100.net (142.251.42.228), 64 hops max, 40 byte packets
 1  192.168.42.2 (192.168.42.2)  0.255 ms  0.141 ms  0.134 ms
 2  192.168.0.1 (192.168.0.1)  0.376 ms  0.312 ms  0.238 ms
 3  140.115.220.254 (140.115.220.254)  0.757 ms  0.863 ms  0.775 ms
 4  203.72.244.177 (203.72.244.177)  0.526 ms  0.526 ms  0.636 ms
 5  211.76.255.130 (211.76.255.130)  3.164 ms  3.481 ms  3.372 ms
 6  203-160-226-13.twgate-ip.twgate.net (203.160.226.13)  15.519 ms  4.813 ms  4.923 ms
 7  203-78-181-189.twgate-ip.twgate.net (203.78.181.189)  5.386 ms
    203-78-181-245.twgate-ip.twgate.net (203.78.181.245)  6.907 ms  5.156 ms
 8  175-41-58-146.twgate-ip.twgate.net (175.41.58.146)  5.350 ms  21.356 ms
    203-78-181-134.twgate-ip.twgate.net (203.78.181.134)  4.814 ms
 9  72.14.195.130 (72.14.195.130)  5.287 ms  5.045 ms  6.018 ms
10  * * *
11  tsa01s11-in-f4.1e100.net (142.251.42.228)  5.358 ms
    142.251.226.168 (142.251.226.168)  5.988 ms
    209.85.245.64 (209.85.245.64)  6.473 ms

// Revised
kola@freebsd:/usr/src/usr.sbin/traceroute $ traceroute www.google.com
traceroute: Warning: www.google.com has multiple addresses; using 142.251.42.228
traceroute to tsa01s11-in-f4.1e100.net (142.251.42.228), 64 hops max, 40 byte packets
 1  192.168.42.2 (192.168.42.2)  0.186 ms  0.056 ms  0.052 ms
 2  192.168.0.1 (192.168.0.1)  0.243 ms  0.387 ms  0.344 ms
 3  140.115.220.254 (140.115.220.254)  0.889 ms  0.979 ms  8.121 ms
 4  203.72.244.177 (203.72.244.177)  0.550 ms  0.803 ms  0.772 ms
 5  211.76.255.130 (211.76.255.130)  3.329 ms  13.877 ms  14.432 ms
 6  203-160-226-13.twgate-ip.twgate.net (203.160.226.13)  4.859 ms  5.097 ms  4.582 ms
 7  203-78-181-189.twgate-ip.twgate.net (203.78.181.189)  6.700 ms
    203-78-181-245.twgate-ip.twgate.net (203.78.181.245)  5.055 ms
    203-78-181-189.twgate-ip.twgate.net (203.78.181.189)  5.461 ms
 8  203-78-181-134.twgate-ip.twgate.net (203.78.181.134)  6.462 ms
    175-41-58-146.twgate-ip.twgate.net (175.41.58.146)  6.849 ms
    203-78-181-134.twgate-ip.twgate.net (203.78.181.134)  5.008 ms
 9  72.14.195.130 (72.14.195.130)  5.284 ms  5.401 ms  5.065 ms
10  * * *
11  142.251.226.168 (142.251.226.168)  6.245 ms
    tsa01s11-in-f4.1e100.net (142.251.42.228)  5.432 ms
    142.251.226.168 (142.251.226.168)  6.282 ms

[yanhaowang]

usr.sbin/traceroute/traceroute.c

1852

Should I use register struct addinfo **res? Can't use register struct addrinfo *res because we can't use the address of register.