- Log NSE histogram to file in addition to testbed-logger when HISTOGRAM_DIR
variable is present in configuration.

- Make logging to testbed-logger optional and only when testbed-logger service
is available.

- This is change is required to get NSE histograms on planetlab nodes.



git-svn-id: https://gnunet.org/svn/gnunet@32883 140774ce-b5e7-0310-ab8b-a85725594a96
- Remove trailing '/' for the directory path.


git-svn-id: https://gnunet.org/svn/gnunet@32884 140774ce-b5e7-0310-ab8b-a85725594a96