zpool reopen should detect expanded devices

Update bdev_capacity to have wholedisk vdevs query the
size of the underlying block device (correcting for the size
of the efi parition and partition alignment) and therefore detect
expanded space.

Correct vdev_get_stats_ex so that the expandsize is aligned
to metaslab size and new space is only reported if it is large
enough for a new metaslab.

Reviewed by: Don Brady <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed by: George Wilson <[email protected]>
Reviewed-by: Matthew Ahrens <[email protected]>
Reviewed by: John Wren Kennedy <[email protected]>
Signed-off-by: sara hartse <[email protected]>
External-issue: LX-165
Closes #7546 
Issue #7582 

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