missleading error message on mountroot prompt

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

hey,

when entering "ufs:ad0s1a" on mountroot>, the system told me something like

no such device 'ad'

entering "ufs:ad2s1a" however worked.  the error message is highly missleading, suggesting that there is no "ad" driver at all.

additionally, the mountroot prompt would benefit from a proper device listing (only listing disk devices, but then also listing available slices and partitions).

cheers
 simon

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