Make starting WEBRick from arbitrary dir work

Also, clean up handling of $top_srcdir; the same thing was computed in way
too many places.

Make starting of WEBRick work by only setting $top_srcdir in config.ru when
it's not set yet. The value computed in config.ru is not right when
starting with WEBRick.

git-svn-id: https://svn.apache.org/repos/asf/deltacloud/trunk@1236528 13f79535-47bb-0310-9956-ffa450edef68
2 files changed