Werk #7475: ceph_status: Adapt to new health field name 'status'

Component	Checks & agents
Title	ceph_status: Adapt to new health field name 'status'
Date	May 6, 2019
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p17 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Ceph health' JSON format has changed in luminous, which lead to a false {WARN} state for affected devices.

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