arcstat parameters are not populated with data

[rugubara]

Latest data in Zabbix show the red flag on arcstat metrics with the following error Value "c_max 4 16636397568" of type "string" is not suitable for value type "Numeric (unsigned)"
I tried to change the userparameter zfs.arcstats[*] command to awk '/^$1/ {printf $3;}' /proc/spl/kstat/zfs/arcstats because it produces a nice number when run from shell - but the problem did go away

[hlovdal]

This issue should be closed since it is a duplicate of #37.