Add a new story describing user and system config

[psss]

Let's say, on my laptop I prefer to test in a container. By adding a custom configuration I would store this default only once and then happily use the short tmt run for all my components.

[pvalena]

LGTM.

[pvalena]

How does one ignore the config thoug? Let's say I wan't to test with 1minutetip or whatnot for this one time...? Commandline? What If I want to use the L2 metadata(ignore the config)?

[psss]

If a value is defined in the plan it overrides default from user/system config:

Configuration should be stored as an ``fmf`` metadata tree
according to ``L2 Metadata`` specification. Default values
from it would be used if value is not specified in the plan.

Command line options override both config and plan content.

[pvalena]

Ah, so it's not an override. In case I want to test in a container, but the plan has already 'virtual', i have to override from commandline.

[pvalena]

In this context, I've encountered other issues (not sure I've reported it yet), which is:

I have specified container image I want to use for my provision, but if just override to --how virtual, the preset still keeps the image settings... Which is a bug IMO.