ZTS: Various test case fixes

* devices_001_pos and devices_002_neg - Failing after FreeBSD ZTS
  merged due to missing 'function' keyword for create_dev_file_linux.

* pool_state - Occasionally fails due to an insufficient delay
  before checking 'zpool status'.  Increasing the delay from 1 to 3
  seconds resolved the issue in local testing.

* procfs_list_basic - Fails when run in-tree because the logged
  command is actually 'lt-zfs'.  Updated the regex accordingly.

Reviewed-by: John Kennedy <[email protected]>
Reviewed-by: Tony Hutter <[email protected]>
Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Kjeld Schouten <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #9748 

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