Werk #6738: mk_oracle: Plugin is compatible against 18c

Component	Checks & agents
Title	mk_oracle: Plugin is compatible against 18c
Date	Oct 2, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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