(dns) Some test depend on resolving external host names

Some InetAddress/DNS tests seem to want to resolve external host names. Whether that's legitimate and a good idea should be examined.
These tests have been observed transiently failing to resolve www.w3c.org, presumably because external network connection was unavailable or down.

1 sun/net/InetAddress/nameservice/dns/CNameTest.java
2 sun/net/InetAddress/nameservice/dns/CNameTest.java
3 java/net/InetAddress/IsReachableViaLoopbackTest.java (intr)
4 java/net/InetAddress/getOriginalHostName.java
5 java/net/InetAddress/IsReachableViaLoopbackTest.java (intr)
6 java/net/InetAddress/getOriginalHostName.java

1 java/net/InetAddress/IsReachableViaLoopbackTest.java (intr)