Add S.M.A.R.T values as separate metric

[vilhelmprytz]

The exporter should scrape the S.M.A.R.T values for each drive, using areca.cli64 disk smart drv=N and parse this output as metrics with each parameter as a label.

Example output:

# areca.cli64 disk smart drv=1
S.M.A.R.T Information For Drive[#01]
===============================================================
Model Name                         : CENSORED
Serial Number                      : CENSORED
Firmware Rev.                      : C40H
Disk Capacity                      : 4000.8GB
Rotation Speed                     : 7200(RPM)
Device Temperature                 : 31 C
Read Errors Receovered W/O Delay   : 0x0000000000000000
Read Errors Receovered W Delay     : 0x0000000000000006
Read Errors Receovered W Retry     : 0x0000000000000000
Read Errors Receovered             : 0x0000000000000006
Read Total Bytes                   : 0x000048C7B7DE6A00
Read Errors Unrecovered            : 0x0000000000000000
Write Errors Receovered W/O Delay  : 0x0000000000000000
Write Errors Receovered W Delay    : 0x0000000000000000
Write Errors Receovered W Retry    : 0x0000000000000000
Write Errors Receovered            : 0x0000000000000000
Write Total Bytes                  : 0x00011B30B326B800
Write Errors Unrecovered           : 0x0000000000000000
Verify Errors Receovered W/O Delay : 0x0000000000000000
Verify Errors Receovered W Delay   : 0x0000000000000000
Verify Errors Receovered W Retry   : 0x0000000000000000
Verify Errors Receovered           : 0x0000000000000000
Verify Errors Unrecovered          : 0x0000000000000000
Non-Medium Errors                  : 0x0000000000000000
Defect PList Block Count           : 0x00000000000345F6
Defect GList Block Count           : 0x0000000000000000
Power On Hours(POH)                : 44464.78
Device Smart Status                : O.K.
===============================================================
GuiErrMsg<0x00>: Success.

It should also convert the values to decimal, for easier read and alerting.

[vilhelmprytz]

Should also be noted that older Areca controllers expose data in a very different kind of format

# areca.cli64 disk smart drv=1
S.M.A.R.T Information For Drive[#01]
  # Attribute Items               Flag Value Worst Thres          Raw    State
===============================================================================
  5 Reallocated Sector Count      0x33   100   100    10            0       OK
  9 Power-on Hours Count          0x32    86    86     0        67383       OK
 12 Device Power Cycle Count      0x32    99    99     0           25       OK
177 Wear Leveling Count           0x13    99    99     5          127       OK
181 Program Fail Count Total      0x32   100   100     0            0       OK
182 Erase Fail Count Total        0x32   100   100     0            0       OK
187 Reported Uncorrect            0x32   100   100     0            0       OK
190 190 Temperature               0x32    72    58     0           28       OK
195 Hardware ECC Recovered        0x1a   200   200     0            0       OK
199 Ultra DMA CRC Error Count     0x3e   100   100     0            0       OK
241 Total LBAs Written            0x32    99    99     0  58108697678       OK
===============================================================================
GuiErrMsg<0x00>: Success.