licensecheck: improvements

[Dmitry Smirnov]

Dear devscripts team,

Benjamin recently wrote in #688843: "PPS: Patches are always welcome. :)"
so I'm accepting the challenge. :)

Please find first set of patches for licensecheck attached.

Patches introduce conservative improvements and test case which is important 
to have before changing any regexes due to risk of regression.

I'd like to continue working on licensecheck so please share your thoughts, 
wishes and implementation ideas.

Also I applied for team membership using form on Alioth but got no reply yet.
(my user name is onlyjob-guest and I'm a DM).

Thank you all for your hard work.

-- 
Regards,
Dmitry.
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