Storage: Do not register issues when skipping entries at the config

[ancorgs]

Problem

At the storage configuration, it's possible to specify a section describing a device (drive, partition, volume group, logical volume, etc.) with a search entry to indicate such a description corresponds to one or several previously existing device(s) that should be found in the system.

That search entry can contain ifNotFound: "skip" to indicate the description should be ignored if the corresponding devices are not found.

If that happens, a warning is added to the list of found issues with a message like "No device found for an optional drive/partition/whatever".

That warning looks overkill. Especially having into account the default value for ifNotFound is "error", which means profiles using "skip" really mean it.

Solution

Reduce the noise by not longer generating the issue for missing optional devices.

[coveralls]

Pull Request Test Coverage Report for Build 11514959566

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 71.491%

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Totals
Change from base Build 11500434799:	-0.01%
Covered Lines:	16927
Relevant Lines:	23677

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💛 - Coveralls

[joseivanlopez]

LGTM, only a suggestion.