Comment 3 for bug 1505524

Well, actually, there is already a framework in place in the code for "guessing" software versions from sysDescr, while there are none in place for retrieving them from a set of proprietary MIBs.

I.e. the simplest solution is to add a regular expression in the ipdevpoll `system` plugin to match and set this software version. I've opted for something that matches ' [A-Z]+\.[0-9]+\.[0-9]+'.

Fix here: https://nav.uninett.no/hg/stable/rev/a778269c5cda