Werk #11040: nfsiostat: don't crash if dots are present in mount point

Component	Checks & agents
Title	nfsiostat: don't crash if dots are present in mount point
Date	May 11, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p12 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

For services that contained a '.' in the mount point the check crashed. This is fixed.

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