iscsiadm completion: incorrect option formatting (--logoutall--show)

[ADI2705]

The iscsiadm bash completion incorrectly merges multiple options into a single string during tab completion.

Specifically, in node mode, the options:
--logoutall and --show

are concatenated as:
--logoutall--show

This results in incorrect and confusing auto-completion output.

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To reproduce

1. Install iscsiadm and ensure bash-completion is enabled
2. Run:
   iscsiadm --mode node --
3. Observe the completion suggestions

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Expected behavior

Options should be properly separated:
--logoutall --show

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Actual behavior

Options are merged:
--logoutall--show

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Versions (please complete the following information)

• Operating system name/distribution and version:
  Rocky Linux 9.7 (Blue Onyx)

• bash version, echo "$BASH_VERSION":
  GNU bash, version 5.1.8(1)-release (x86_64-redhat-linux-gnu)

• bash-completion version, (IFS=.; echo "${BASH_COMPLETION_VERSINFO[*]}"):
  2.11

• iscsiadm version:
  6.2.1.11

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Additional context

The issue originates from the completion script:
completions-core/iscsiadm.bash

In the node case, the options string contains:
--logoutall--show

which is missing a space between two valid options.

This causes bash completion to treat it as a single invalid option instead of two separate options.

Proposed fix:
Replace:
--logoutall--show

With:
--logoutall --show

I can submit a PR with this fix if this approach is acceptable.