Add S.M.A.R.T metrics (#1209)

Update metrics following SMART attributes in [1][2]
- Seek_Error_Rate - ID: 7
- Reallocated_Event_Count - ID: 196

[1] https://en.wikipedia.org/wiki/S.M.A.R.T.#Known_ATA_S.M.A.R.T._attributes
[2] https://en.wikibooks.org/wiki/Minimizing_Hard_Disk_Drive_Failure_and_Data_Loss/Self-Monitoring,_Analysis,_and_Reporting_Technology

Signed-off-by: Dai, Dang Van <daikk115@gmail.com>

text_collector_examples/smartmon.sh

@@ -44,9 +44,11 @@ power_cycle_count
 power_on_hours
 program_fail_count
 raw_read_error_rate
+reallocated_event_count
 reallocated_sector_ct
 reported_uncorrect
 sata_downshift_count
+seek_error_rate
 spin_retry_count
 spin_up_time
 start_stop_count