Modify _assertEqualListsOfObjects() function.

Function _assertEqualListsOfObjects() changed in order to compare lists of
objects without `id` key. It can be usefull if we have no `id` in test data.

Change-Id: Ic3d599166e5a83969ef804bc9f7801cd2c9d0770
Merge "Modify _assertEqualListsOfObjects() function."