Add performance read/write bytes to disks and FCP or ISCSI
in FCPOPS and ISCSIOPS check.
Now is nagioscache files with only necessary values
(for FCPOPS only FCP values, no NFS or CIFS or ISCSI).
On all *OPS check store value to global variable when
writing to nagioscache file. Now getting value only once,
this output is precisely and using less SNMP queries.
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