Fix number of rows in Digitrakker loader

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
[test] Add Digitrakker loader test

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Refactor redundant code in Digitrakker loader

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>