* Give the interface procedure a meaningful name.
* Order the procedure's clauses by relevance.
* Log something informative for each clause.
* Dialyzer type & signature for the procedure.
This is a better choice than having the server retrieve the directory
name itself: (1) we can have guarentees earlier from the application,
and (2) it makes testing easier and clearer.
The test set would fail before it began because the application
couldn't retrieve a path to a whitlist directory from it's
configuration data. This change makes the application look for
whitelisted certificates in a default directory. The corresponding
test stops the application, changes the configuration, and starts it
to test with given configuration parameters.
Joseph Yiasemides