run-zts test procfs/pool_state failed with uncorrectable I/O failure

Once we trigger the zpool scrub, all zpool/zfs command gets stuck for
180 seconds. Post 180 seconds zpool/zfs commands gets start executing
however few more seconds(10s) it take to update the status. hence
sleeping for 200 seconds so that we get the correct status.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: vaibhav.bhanawat <vaibhav.bhanawat@delphix.com>
Closes #15364