Configuration Server's RevisionAccess returns invalid results when listing nested files

[mariusoe]

The current implementation of the rocks.inspectit.ocelot.file.accessor.git.RevisionAccess#collectFiles contains a bug which leads to invalid results.
The mentioned method recursivly list files in a specified directory but does not handle the case when the tree walker leaves a directory, leading to the problem that all files will end up in one single directory in the resulting data structure.

Example:
the following structure

/file.yml
/first/file_a.yml
/second/file_b.yml

would be represented as

/file.yml
/first/file_a.yml
/first/second/file_b.yml