allow iptables package to be updated

[cristifalcas]

Add a new parameter in order to allow the iptables package to be updated

[bmjen]

Thanks @cristifalcas! This looks like a good addition. Can you please squash the two commits into one?

[mentat]

Hi again @cristifalcas, would you mind squashing this down?

[cristifalcas]

sorry for the delay

[tphoney]

@cristifalcas Thanks for the work that you have put in, there are a number tests failing, could you please have a look.

[cristifalcas]

Fixed

[tphoney]

Thanks, can you please squash. the code looks good to me.

[cristifalcas]

I have no idea how to remove the "Merge remote-tracking branch" commit. Is it ok if I close this PR and open a new one?

[tphoney]

if you are on the CLI:
git rebase --interactive HEAD~2

it will look something like

pick 690cb20 Adding bug workaround in tests for Debian 8
pick 750948e Enabled usage of the $ntpsigndsocket parameter, for socket signing when needed.

change it to

pick 690cb20 Adding bug workaround in tests for Debian 8
s 750948e Enabled usage of the $ntpsigndsocket parameter, for socket signing when needed.

This will squash that commit.

Then re-push again

[tphoney]

or https://git-scm.com/book/en/v2/Git-Tools-Rewriting-History#Squashing-Commits

[tphoney]

or create a new pr 👍

[cristifalcas]

done

[tphoney]

great work !!!