fix port sorting in generated firewall rules file

[igolman]

Description

given ports argument als array of strings like:

firewall_rule 'allow some ports' do
  port %w(80 88 389 443 464 636)
  source '10.10.10.10'
end

generates in /etc/default/ufw-chef.rules file:
ufw allow in proto tcp to any port 389,443,464,636,80,88 from 10.10.10.10 comment "allow some ports"

after this fix:
ufw allow in proto tcp to any port 80,88,389,443,464,636 from 10.10.10.10 comment "allow some ports"

Issues Resolved

Correct generation of firewall rules.

Check List

• A summary of changes made is included in the CHANGELOG under ## Unreleased
• New functionality includes testing.
• New functionality has been documented in the README if applicable.

[damacus]

Can you update the changelog as per the PR comments please 👍🏼

[igolman]

Can you update the changelog as per the PR comments please 👍🏼

Done.

[Stromweld]

Please look into failing tests