Add an option in Jetski to build a cluster with a single node master

[ashishkamra]

Many OpenShift cluster deployments within perf dept are used for testing data plane workloads on one or two worker nodes. To build a two worker node cluster, a total of 6 machines need to be requested (3 Masters, 2 workers, 1 provisioning/admin/jump). The idea behind this enhancement is to bring down such requirement to 4 machines by building an OpenShift cluster with a single node master - as described by @jmencak in his notes - https://docs.google.com/document/d/1_T-ZBAz4yoU5B_EI2e70xDrGXEM-4gqWqnQYzvq471I/edit. This will help improve the alias lab utilization which is running at > 90% capacity due to increased demands for building OpenShift clusters.

[smalleni]

@ashishkamra Please use jetlag for deploying an SNO (master+ worker) which should also server your usecase. You can use jetlag to do this: https://github.com/redhat-performance/jetlag

The reason you need jetlag is because it uses the assisted installer which supports SNO whereas jetski is based on the IPI installer which does not support SNO deployments.

[github-actions[bot]]

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