Rename '1.7.x-r1383438' branch to '1.7.x-serf-server-root-segfaults'.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.7.x-serf-server-root-segfaults@1383952 13f79535-47bb-0310-9956-ffa450edef68