- fix shell script issues
- `bx` is deprecated; rename to `ibmcloud`
- remove unnecessay variable replacement in hollow-node_template.yaml
- add replacement logic for HOLLOW_KUBELET_TEST_ARGS and HOLLOW_PROXY_TEST_ARGS
- don't hardcode KUBEMARK_IMAGE_REGISTRY to brandondr96
- make cluster number and spec configurable
- make number and spec of workers configurable
- separate NUM_NODES and KUBEMARK_NUM_NODES