[bsc#1163149] Do not activate devices twice

[imobachgs]

This PR implements support for kernel activated devices in s390 systems. Until now, AutoYaST took care of activating zfcp and dasd devices. From now on, those devices can be already pre-configured, so AutoYaST should check if they are already activated.

This PR skips the activation for:

• zFCP controllers
• zFCP disks
• DASD disks

For the time being, I have decided to simply write a message in the log (the device is activated, so what?). But we can decide to display some kind of message if preferred.

Network related PR: yast/yast-network#1052
Trello: https://trello.com/c/MNlAfnwx/

A simpler approach?

After finishing the PR, I realized that in SP1 (not sure about SP2) the configuration scripts for zFCP devices will not complain about a device being activated twice. Actually, the original bug is caused because we are trying to change the diag configuration value of an already activated one.

So if this code looks too much, we could simply keep the behavior for DASD devices and ignore zFCP.

TODO

• Handle DASD disks
• Handle zFCP controllers
• Handle zFCP LUNs
• Display a message (or register it on the log)

[coveralls]

Coverage increased (+0.9%) to 8.1% when pulling 04ab854 on bsc-1163149/s390-active-devices into 07fa611 on master.

[yast-bot]

✔️ Public Jenkins job #14 successfully finished
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[yast-bot]

✔️ Internal Jenkins job #7 successfully finished
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