Otherwise the logger gets multiple handers (and the user get duplicate
logging output) if another tinfoil instance is initialized after one is
shut down().
(Bitbake rev: 74d67be7a4b591fab2278f7c184f282d11620c62)
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>