Modified testcases for 19.001 and 19.001 (DST). 19.001 tests now
multiple timezones and 19.001 (DST) resets the DPTXlator's private field
such that the order of test case execution chosen by JUnit won't matter.
Merge pull request #1407 from Snickermicker/Bugfix_1344

[KNX] Attempting bugfix for #1344