Add unit test for data_utils

This commit adds data_utils except build_url function because of no user
for that function.

Note: Removing build_url function is another topic. So the patch is
separated: I8989ac12f36f342ca1066cc65f7a427a83de721f .

Partially implements bp unit-tests

Change-Id: I1e3b3c4916144fe82c5708a6c30fe94a3d1c5e58
Merge "Add unit test for data_utils"