NVIDIA / holodeck / 23747562636

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fix: use grep -w for exact IP matching in cluster node configuration (#757)

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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