cephfs-journal-tool: check fsid when import purge queue

cephfs-journal-tool: check fsid when import purge queue
import purge queue will triger file delete in cluster.
we occasionally imported a purge queue from one production
cluster to a test cluster and found the the fs in test cluster
was damaged because some objects are really delted as its inode
recorded in purge queue.

add fsid when exporting purge queue, check if the fsid matched when
importing purge queue. This could make cephfs-journal-tool safer to
handle purge queue issues.

Signed-off-by: Gu Zhongyan <guzhongyan@360.cn>
Signed-off-by: yupeng chen chenyupeng-it@360.cn