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Changes required to have v3 plugin natively support the V2.1 API. The parameters is changed from os-server-usage to OS-SRV-USG Partially implements blueprint v2-on-v3-api Co-Authored-By: Chris Yeoh <cyeoh@au1.ibm.com> Change-Id: I4a4ebe533f8910a29b54d6ec9554cc151af492d1