Fix a bug in 'fsfsfixer'. When parsing a node-rev-id containing multiple
occurrences of '.r', such as '11-1.r-1234.r1234/500', it failed with the
error message 'ValueError: too many values to unpack'.

* contrib/server-side/fsfsfixer/fixer/find_good_id.py
  (parse_id): Parse node-rev-ids correctly.

Suggested by: Yangxufeng Zhao <yangxufeng.zhao{_AT_}alipay.com>
in the email "subversion pull request: fix multiple .r in id" to dev@ on
2013-12-20, <http://svn.haxx.se/dev/archive-2013-12/0145.shtml>.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1554939 13f79535-47bb-0310-9956-ffa450edef68