Optionalize bash completion.

[3405691582]

To allow for a low-dependency installation of cloud-init, optionalize the bash-completion dependency, defaulted to true. This means behaviorally nothing changes, but that the bash-completion features can be easily turned off if not desired.

Proposed Commit Message

feat: Optionalize bash completion.

To allow for a low-dependency installation of cloud-init, optionalize the
bash-completion dependency, defaulted to true. This means behaviorally
nothing changes, but that the bash-completion features can be easily
turned off if not desired.

Additional Context

n/a

Test Steps

• Testing: with bash-completion not installed, meson build -Dbash-completion=false ... runs successfully, meson build -Dbash-completion=true ... and with -D option omitted displays error.

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)

[blackboxsw]

Thanks for contributing to cloud-init. I agree with this approach and the ability to limit package dependencies where unnecessary.

[blackboxsw]

Thanks again @3405691582 if you agree to the changes suggested above I;ll happily merge this approach.

[3405691582]

Done. Thanks!

[blackboxsw]

LGTM!