Werk #4297: oracle_instance: fixed discovery function

Component	Checks & agents
Title	oracle_instance: fixed discovery function
Date	Jan 25, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Some old {{mk_oracle}} plugin outputs are wrong formatted such that discovery function detects wrong items.

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