HADOOP-8545. Filesystem Implementation for OpenStack Swift

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1526848 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8545. Filesystem Implementation for OpenStack Swift

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1526852 13f79535-47bb-0310-9956-ffa450edef68