Werk #4174: added missing perfometer for interface services

Component	Checks & agents
Title	added missing perfometer for interface services
Date	Dec 20, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p16 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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