Fix uninitialized variable snapprops_nvlist in zfs_receive_one

The variable snapprops_nvlist was never initialized, so properties
were not applied to the received snapshot.

Additionally, add zfs_receive_013_pos.ksh script to ZFS test suite to exercise
'zfs receive' functionality for user properties.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #4338