Do not upgrade userobj accounting for snapshot dataset

'zfs recv' could disown a living objset without calling
dmu_objset_disown(). This will cause the problem that the objset
would be released while the upgrading thread is still running.

This patch avoids the problem by checking if a dataset is a snapshot
before calling dmu_objset_userobjspace_upgrade().  Snapshots
are immutable and therefore it doesn't make sense to update them.

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Jinshan Xiong <[email protected]>
Closes #5295 
Closes #5328 

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