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* Moved 'ems-core' into 'nebulous' dir, and updated it from main repo. * Add 'ems-nebulous' plugin code, the 'metric-model' specs, and a top-level pom.xml to build everything (including EMS-Nebulous image) * Added .gitattributes and changed EOL to LF in top-level files. * Also adopting code to pass Zuul checks Change-Id: Ic414a1fa382d0a9112cbc805375cf603af59cd37