Update tearDown methods in API integration tests

After testing new script run_functional_tests one destructive issue
was discovered that after this script all executions were deleted.

This situation was fixed. Now in all create methods identifier of
created object saves in array and in tearDown methods tests delete
only objects which were saved in appropriate arrays.

Change-Id: I442aecd346c003cd38ce6977e4f69f9bfa32e894
Merge "Update tearDown methods in API integration tests"