Fix 'zpool import' blkid device names

When importing a pool using the blkid cache only the device
node path was added to the list of known paths for a device.
This results in 'zpool import' always using the sdX names
in preference to the 'path' name stored in the label.

To fix the issue the blkid import path has been updated to
add both the 'path', 'devid', and 'devname' names from the
label to the known paths.  A sanity check is done to ensure
these paths do refer to the same device identified by blkid.

Signed-off-by: Brian Behlendorf <[email protected]>
Signed-off-by: Tony Hutter <[email protected]>
Closes #4523
Closes #3043

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