timedrift.cfg: change the ntp, date variants

Change the ntp, date variants to share the same with_load.
And add full_load variant for with_load.
Signed-off-by: Xiangmin Han <xhan@redhat.com>
tests.timedrift: Make all variants explicit

And remove variants with default in their name. We do
have new cartesian features that can make us get away
with naming variants 'default', but for now, let's
play safe and use more unique variant names.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
virttest.standalone_test: return when pressing "q" in list view

When using --list-tests, the test list is piped to
something that can handle it (usually, the unix command
'less'). If one quits less, using the shortcut 'q',
an IOError is raised.

Let's handle this more gracefully, making the function
tied to --list-tests to return when an IOError is raised.

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