Add docker version check for vFile plugin.

vmware-archive / vsphere-storage-for-docker

vSphere Storage for Docker

https://vmware.github.io/vsphere-storage-for-docker

Apache License 2.0

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Add docker version check for vFile plugin. #2014

Closed luomiao closed 6 years ago

luomiao commented 6 years ago

We have a minimum version requirement for docker server at 17.06 for vFile. This PR adds check of docker version during the vFile plugin installation process. Userguide is updated according to possible error after the failure of version check. A vendor dependency on hashicorp/go-version is added.