Invalid API version endpoint

According to SOL 013 (https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/013/02.06.01_60/gs_nfv-sol013v020601p.pdf) the endpoint should have an underscore, not a hyphen:

/api-versions should /api_versions

replica of: SOL005#3 (closed)

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