src/: Rename `udpsocket' and `nudp' (style)

[adns] / regress / case-longdom1.out

adns debug: using nameserver 172.18.45.6
10rndrobwlxxxxxxxxxxlllantysiliogog.llanfairpwllgwyngyllgogerychwyrndrobwlxxxxxxxxxxlllantysiliogog.llanfairpwllgwyngyllgogerychwyrndrobwlxxxxxxxxxxlllantysiliogog.llanfairpwllgwyngyllgogerychwyrndrobwlxxxxxxxxxxlllantysiliogog.relativity.greenend.org.uk. flags 1 type 1 A(-) submitted
10rndrobwlxxxxxxxxxxlllantysiliogog.llanfairpwllgwyngyllgogerychwyrndrobwlxxxxxxxxxxlllantysiliogog.llanfairpwllgwyngyllgogerychwyrndrobwlxxxxxxxxxxlllantysiliogog.llanfairpwllgwyngyllgogerychwyrndrobwlxxxxxxxxxxlllantysiliogog.relativity.greenend.org.uk. flags 1 type A(-): Domain name or component is too long; nrrs=0; cname=$; owner=$; ttl=604800
rc=0