HADOOP-10710. hadoop.auth cookie is not properly constructed according to RFC2109. (Juan Yu via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1606923 13f79535-47bb-0310-9956-ffa450edef68

Conflicts:
	hadoop-common-project/hadoop-common/CHANGES.txt