client tests: Remove crontab module

We would like to have a single linux-tools test suite
that tests utilities such as cron, pax, time, and
other utilities. I've asked the test authors to work
on the mentioned test suite, therefore it is best to
drop this individual module.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
virt: Updating to latest master

Updating the virt tests to the latest master.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>