Increase coverage for Sub's methods to 50 percent.

[miccagiann]

Adding tests for Sub type.

Something to touch later: I cannot understand the func (settings LogSettings) Copy() LogSettings. It seems to me that it returns the same LogSettings instance instead of creating a new one.

[muir]

LogSettings has no pointers, maps, or slices in it and thus a copy is a copy and not linked.

[muir]

LogSettings has no pointers, maps, or slices in it and thus a copy is a copy and not linked.

Hmm, that's not right with respect to prefill.

[muir]

LogSettings has no pointers, maps, or slices in it and thus a copy is a copy and not linked.

Hmm, that's not right with respect to prefill.

And prefill is copied.

[muir]

Thanks!