zfs_receive_010_pos: change dd arguments

The  `dd` command as written will not create a hole in the file.
Additionally, the `stride` argument isn't understood by `dd` so
it's replaced with `seek` which isn't equivilant but will result in
a single whole which is sufficient for the test case.  Finally,
`conv=notrunc` is added to avoid truncating the file.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Signed-off-by: George Melikov <[email protected]>
Closes #6023 

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