feat(CSI-259): report mount transport in node topology

[sergeyberezansky]

TL;DR

Added support for scheduling workloads by transport protocol (NFS or WekaFS) using node topology.

What changed?

• Updated NFS.md documentation to include information about scheduling workloads by transport protocol.
• Added constants for NFS and WekaFS data transport types.
• Implemented getTransport() method for both NFS and WekaFS mounters.
• Modified NodeGetInfo function to include transport type in node topology.

How to test?

1. Deploy the updated Weka CSI Plugin in a hybrid cluster having both nodes with weka client installed and not installed, while setting pluginConfig.mountProtocol.allowNfsFailback=true
2. Create a PVC and a pod with a nodeSelector specifying the desired transport:

   nodeSelector:
     topology.weka.com/transport: wekafs

   or

   nodeSelector:
     topology.weka.com/transport: nfs

3. Verify that the pod is scheduled on a node with the specified transport type.

Why make this change?

This change allows administrators to optimize workload placement based on the available transport protocol. In hybrid deployments where some nodes have the Weka client installed and others don't, storage-intensive workloads can be directed to nodes with WekaFS transport, while more generic workloads can use NFS transport. This flexibility enhances performance and resource utilization in diverse Kubernetes environments.

[sergeyberezansky]

• feat(CSI-259): report mount transport in node topology #337 👈
• dev

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"Request reviewers once CI passes" took an action on this PR • (09/18/24)

1 reviewer was added to this PR based on Sergey Berezansky's automation.