On the 'move-tracking-2' branch: Tweak the branch listsing output.

* subversion/svnmover/svnmover.c
  (family_list_branch_instances): Display EID:path mappings more concisely.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/move-tracking-2@1628145 13f79535-47bb-0310-9956-ffa450edef68