Fix scylladb example so it deploys on default gke nodes

[tnozicka]

Description of your changes:
2nd node withoutany sysctl adjustments fails on GKE, this will make sure it works a bit more before we have #749

Which issue is resolved by this Pull Request:

FATAL: Exception during startup, aborting: std::runtime_error (Could not setup Async I/O: Resource temporarily unavailable. The most common cause is not enough request capacity in /proc/sys/fs/aio-max-nr. Try increasing that number or reducing the amount of logical CPUs available for your application)
2023-11-14 11:50:42,850 INFO exited: scylla (exit status 7; not expected)
Traceback (most recent call last):
  File "/opt/scylladb/scripts/libexec/scylla-housekeeping", line 196, in <module>
    args.func(args)
  File "/opt/scylladb/scripts/libexec/scylla-housekeeping", line 122, in check_version
    current_version = sanitize_version(get_api('/storage_service/scylla_release_version'))
                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/scylladb/scripts/libexec/scylla-housekeeping", line 80, in get_api
    return get_json_from_url("http://" + api_address + path)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/scylladb/scripts/libexec/scylla-housekeeping", line 75, in get_json_from_url
    raise RuntimeError(f'Failed to get "{path}" due to the following error: {retval}')

[zimnx]

/lgtm

[scylla-operator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tnozicka, zimnx

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [tnozicka,zimnx]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment