[PR #4933/9a928d5f backport][stable-4] Fix code in rax_clb_nodes that breaks in Python3

[patchback]

This is a backport of PR #4933 as merged into main (9a928d5).

SUMMARY

Fix syntax in rax_clb_nodes that breaks in Python3

• Use syntax that works in both Python 2 and 3 when iterating through a
  dict that's going to be mutated during iteration
• Fixes dictionary changed size during iteration error
• Fixes community.general.rax_clb_nodes not working with python3 #4932

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

community.general.rax_clb_nodes defined here: https://github.com/ansible-collections/community.general/blob/main/plugins/modules/cloud/rackspace/rax_clb_nodes.py

ADDITIONAL INFORMATION

Prior to this change, you are unable to run the rax_clb_nodes task against hosts that only have Python 3 installed. You would get this error:

RuntimeError: dictionary changed size during iteration

Now it works as expected under hosts with Python 2 or Python 3.

[ansibullbot]

cc @neuroid
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