Restore purged curl to ubuntu boxes

[eshamow]

Despite sharing a post-install script with Debian, purge on Ubuntu removes curl. This is a clumsy workaround, but it does ensure that curl is available on the box, which provides parity with other platforms.

Also removes a trailing space in an unrelated file.

[beddari]

Hoping this will be merged as having curl on the boxes pushes back the point-in-time ⨝ version when SNI is supported by quite a stretch.

[juliandunn]

I'm not so sure I care that much about "parity against other platforms", particularly insofar as curl is concerned. I'd gladly strip it out of all the boxes actually, assuming the entire userland wouldn't break...

[eshamow]

It's more the fact that since it's available everywhere else, any downstream tool that uses these boxes has to specifically check for Ubuntu and then install curl.

It's such a basic tool to be able to grab anything - even a deb to install packages.

That said if you want it gone, happy to fix parity by closing this PR and opening a new one to pull from all. It just seems like a sensible and minimal tool to have across the board, and a small one.

[juliandunn]

Yeah, I think that's the direction I'd rather go @eshamow.

[juliandunn]

As discussed I'm going to close this as WONTFIX.