Instrument binaries for integration test

[visola]

Description

When running the integration tests, there's no way to collect coverage information as is. But it is possible to wrap the binary in a unit test so that it would spit the coverage to a file.

Acceptance Criteria

• Binaries used during integration tests are instrumented with coverage measurement
• A coverage file is generated after each integration test finishes
• The final coverage report is generated from data merged from all files, integration and unit tests