Werk #7281: legacy local plugins: added missing register_hook call

Component Core & setup
Title legacy local plugins: added missing register_hook call
Date Oct 21, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0p6 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Legacy local web plugins failed to load if they used some register_hook call.

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