Optimize ccw screen in subiquity on s390x by having the CCW types collapsed by default

[Frank Heimes]

The current subiquity version for s390x presents ALL CCW devices (the special Z systems devices) on one screen based on the output of lszdev.

Depending on the definition of a z system (especially LPARs) it can have huge amounts of (virtual) devices (even in the hundreds).
Hence a suggestion is to collapse all list of CCW devices by default,
so that only the types are visible, like qeth, dasd-eckd, dasd-fba, etc.

That would avoid unnecessary long scrolling and would allow quicker access to the relevant devices.

[Frank Heimes (fheimes)]

Even more sophisticated would be to be to expand the list automatically in case it fits on the (standard) screen and to collapse if it doesn't (but of course wishlist ;-)