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If the tools for checking thin_pool or cache metadata are missing, issue rather just a WARNING, but let the operation of activation continue. This has the advantage, the if user is missing those tools, but he already started to use thinpool or cacheing, he can access these volumes with a WARNING. Also if the user is using too old tools i.e. for CacheV2 format dmpd tool 0.7 is required - provide informative WARNING and skip failure from older tool version which can't understand new format V2.