license.py: fix behaviour of copyleft_compliance

actually if a package has a license in its LICENSE variable
which is not in the whitelist nor in the blacklist and even
if an other license in this variable is in the whitelist,
the package gets excluded and is not taken in account in the
copyleft_compliance.
This patch solves this by excluding a recipe _only_ if the
LICENSE variable includes a pattern from the blacklist and
including a recipe only if it includes a variable from the
whitelist _and_ none from the blacklist.

Example in busybox which has LICENSE="GPLv2 & BSD-4-Clause",
with the actual behaviour (where he blacklist contains only
CLOSED Proprietary) we get :
DEBUG: copyleft: busybox-1.19.4 is excluded: recipe has excluded licenses: BSD-4-Clause
which is not sane because busybox is covered by a copyleft license
which is GPLv2 and should match the default whitelist which is
GPL* LGPL*.

Signed-off-by: Eric Bénard <eric@eukrea.com>

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