Show mirror image sync status in Attr field

Since now we can add mirrors to the existing mirrors, some mirror images are in-sync while other are out-of-sync.

This patch shows the mirror image sync status in Attr field as volume type character.
'i' used to mean 'mirror image'.
With this patch, 'i' means 'mirror image in-sync'. 'I' means 'mirror image out-of-sync (syncing)'.

Thanks,

Jun'ichi Nomura, NEC Corporation of America
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