Update check_snmp_raid.pl

minor fix: $phd_nagios_status has to get a value from 3d column of PHYDRV_CODES and not 2nd one.
Update check_snmp_raid.pl

add physical drive information (drive vendor and model) for adaptec adapters
Merge pull request #18 from giner/patch-2

Update check_snmp_raid.pl: drive model & vendor info for adaptec cards