zfs import fails

[sandeepkapse]

Steps to reproduce problem :

> zpool create tank /dev/sdb -f

> zpool destroy tank

> zpool import -D tank

_ cannot import 'tank': more than one matching pool
import by numeric ID instead
cannot import 'tank': more than one matching pool
import by numeric ID instead
_

The same operation on Solaris Does not produce any error.

Note : 1) This happens when there is no pool on system.
2) Cache file /etc/zfs/zpool.cache seem to be appear only when there is at least on pool exist.
3) In Solaris there is always at least one pool exists as root file system of Solaris is zfs.