Clarify InetAddressTest failure message.

InetAddressTest#test_getByName_invalid can fail if the DNS resolver
in use resolves numeric addresses such as "1.2.3.4.". Dnsmasq is
known to do this.

Bug: 115960287
Test: atest CtsLibcoreTestCases:libcore.java.net.InetAddressTest
Change-Id: I62e6df2b44ed0f631c3188260c7712b5877f9b9c
1 file changed