Fix docker version parsing

[ukkopahis]

A docker version like 20.10.5+dfsg1 wasn't recognized. Now strips all '+' and '-' postfixes.

Fixes #447
Fixes #496

[Paraphraser]

This is probably a good idea but I'm not 100% convinced it's the right way to go. It's the correct solution, technically, but I'm worried it masks a deeper problem. The + suffix appears to be the result of installing a (somewhat obsolete) version of docker-compose using apt (which is how IOTstack menu and install scripts have done it since gcgarner days).

How installing docker-compose can cause docker to get a + suffix version number is something I don't understand but we can put a pin in that.

In and of itself, having a somewhat obsolete docker-compose is not too big of a problem ("user's system, user's rules"). Where I start to get a bit worried is what the change to docker's version number implies. Is it just confined to the version number or did other things get changed too?

Where I start to get really worried is what happens if you then try to upgrade to modern docker-compose because, once docker gains a + suffix, uninstalling the apt version of docker-compose breaks docker and you basically have to nuke everything (and if Home Assistant is part of the deal, that has to be nuked too).

I've been thinking of the + suffix as akin to a canary in a coal mine. Changing the code to ignore the suffixes feels a bit like not paying attention to the canary.

[ukkopahis]

Ok, so we should add a version-check for docker-compose version as required. But that is a separate issue.