Add a (global) variable to define path to tests configurationn

[Desrever Nu]

NOTE: work on this ticket after resolving #323

Whether on a properties file or in the Admin static variables, define once and for all the variable

    private static String testconfigdir = "config/myconfig";

used in tests, and update tests

[Desrever Nu]

wait for #323 to be resolved

https://bitbucket.org/JordanLeePeershares/nubottrading/issue/323/take-a-final-decision-about

[Desrever Nu]

the issue is marked as resolved, but I believe we should define the testconfigdir in Settings.java .

[Desrever Nu]

capitalized variable named and refactored