Werk #11996: mem: remove pointless metrics for LXC containers

Component	Checks & agents
Title	mem: remove pointless metrics for LXC containers
Date	Jan 23, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The metrics "Committed" and "Largest VM Alloc" are useless for LXC containers, so they are filtered out in the agent.

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