Werk #15299: nfsiostat: fix units and parsing

Component	Checks & agents
Title	nfsiostat: fix units and parsing
Date	Oct 25, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p13 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p37 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Units falsely displayed seconds, although milliseconds are corret.

Newer versions of nfsiostat output more data, this confused our parser.

To the list of all Werks