F #547: Add floating_only VR nic IP allocation

[sk4zuzu]

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Description

Since https://github.com/OpenNebula/one-ee/commit/0a7a03e098d4da6db5f057cec29daf56028b83b6 VR instances support instance deployment without NIC-dedicated IPs if the VIP is defined and is marked floating_only. This PR enables that feature in the Provider.

References

Close #547

New or Affected Resource(s)

• opennebula_virtual_router_nic

Checklist

• I have created an issue and I have mentioned it in References
• My code follows the style guidelines of this project (use go fmt)
• My changes generate no new warnings or errors
• I have updated the unit tests and they pass succesfuly
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation (if needed)
• I have updated the changelog file