NVIDIA / holodeck / 23746348166

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fix: use grep -w for exact IP matching in cluster node configuration

When configuring cluster nodes, the grep command used to find node names
by private IP would match IP prefixes as substrings (e.g., 10.0.1.8
matching 10.0.1.81), concatenating multiple node names with a newline.
This caused kubectl to fail with "nodes not found" for the combined
string.

Add -w flag to grep for word-boundary matching, ensuring each IP matches
only its exact occurrence in kubectl output.

Fixes #756

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

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