Werk #1677: f5_bigip_interfaces: Cleaned up check a bit

Component	Checks & agents
Title	f5_bigip_interfaces: Cleaned up check a bit
Date	Dec 4, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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