[v15] Allow a custom SSH dial timeout to be set cluster wide #45651
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A new SSHDialTimeout field is added to the ClusterNetworkingConfiguration to allow cluster admins to override the default dial timeout of 30s. The dial timeout is made available in /webapi/ping, stored in the tsh profile, and cached on disk like other similar cluster settings so that tsh ssh can consume the relevant information without requiring an additional round trip to the cluster. At the moment, there is no support for an unlimited dial timeout, as that would cause complexity with backwards compatibility.
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marcoandredinis
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tigrato
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Backport #45507 to branch/v15
Changelog: Permit setting a cluster wide SSH connection dial timeout