[HADOOP-12485] Don't prefer IPV4 stack on tests.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HADOOP-11890
• Component/s: test
• Assignee: Elliott Neil Clark
• Reporter: Elliott Neil Clark
• Created: 16/Oct/15 00:51
• Updated: 29/Dec/15 21:55
• Resolved: 29/Dec/15 21:55

Description

Don't prefer ipv4 stack and instead use ipv6 if it's there. This should mean that tests actually bind on ipv6 if it's there.
It should mean that tests running against this branch are more likely to be representative of what would be running in production.