support Namenode HA failover
fix not to retry failover twice
fix to use hosts selected under HA status
v0.5
Checking in changes prior to tagging of version 0.5.

Changelog diff is:

diff --git a/Changes b/Changes
index 42a89f4..40b30e1 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,8 @@ Revision history for Perl extension Net-Hadoop-WebHDFS

 {{$NEXT}}

+0.5 2014-06-03T10:05:18Z
+
    - support Namenode HA

 0.4 2013-09-30T06:37:07Z