Update samples yaml

[ryantd]

Why are these changes needed?

1. Update configmap
   1. Rename the script to avoid a "ray has no attribute init" issue [1]
   2. Fix services.get_node_ip_address
   3. Change ray_nodes dir to avoid a Permission error
2. Update yaml
   1. Bump rayVersion to 1.8.0
   2. Bump ray image version to 1.8.0
   3. Change command: sleep infinity
   4. Add a comment on init-myservice's command

[1]:

trying to connect to Ray!
Traceback (most recent call last):
  File "/opt/code.py", line 1, in <module>
    import ray
  File "/home/ray/anaconda3/lib/python3.7/site-packages/ray/__init__.py", line 91, in <module>
    import ray._raylet  # noqa: E402
  File "python/ray/_raylet.pyx", line 118, in init ray._raylet
  File "/home/ray/anaconda3/lib/python3.7/site-packages/ray/_private/runtime_env/validation.py", line 11, in <module>
    from ray._private.runtime_env.plugin import RuntimeEnvPlugin
  File "/home/ray/anaconda3/lib/python3.7/site-packages/ray/_private/runtime_env/plugin.py", line 3, in <module>
    from ray.util.annotations import DeveloperAPI
  File "/home/ray/anaconda3/lib/python3.7/site-packages/ray/util/__init__.py", line 14, in <module>
    from ray.util import rpdb as pdb
  File "/home/ray/anaconda3/lib/python3.7/site-packages/ray/util/rpdb.py", line 16, in <module>
    from pdb import Pdb
  File "/home/ray/anaconda3/lib/python3.7/pdb.py", line 76, in <module>
    import code
  File "/opt/..2021_11_19_09_25_09.256271217/code.py", line 5, in <module>
    ray.init(address="auto", _redis_password=redis_pass)
AttributeError: module 'ray' has no attribute 'init'

Related issue number

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(

[Jeffwan]

Thanks for the contribution, the change looks good to me beside above minor comment

[ryantd]

@Jeffwan PTAL