rutil: FileSystem: log stat() error

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-gsoc-2013@10431 ddefafc4-47db-0310-ae44-fa13212b10f2
rutil: FileSystem: add support for full filename in iterator, fix problem with using stat() on relative path

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-gsoc-2013@10432 ddefafc4-47db-0310-ae44-fa13212b10f2