tools: enable unit tests

The tools package contains some useful unit tests, which are
unfortunately disabled since they are intermixed with integration tests.

This patch replaces the all-out disabling of the package's tests with a
black list of component tests, allowing the unit tests to run in build
time.

Change-Id: Ic9205fd5d46fb8e44c0ad87cfbe4c3b5c7817dbe
Signed-off-by: Allon Mureinik <amureini@redhat.com>