CP-8629: Install coverage

Install coverage package, so unit test coverage could be measured.

Signed-off-by: Mate Lakat <mate.lakat@citrix.com>
CP-8629: Run unittests with coverage

Run unittests with coverage and report both unit test results and
coverage in computer consumable format.

Signed-off-by: Mate Lakat <mate.lakat@citrix.com>