Move codebase to MPL.

SUSE-contributed code is MPLv2, other patch contributors have
consented to new license.

Signed-off-by: Kohei Yoshida <kohei.yoshida@gmail.com>
Signed-off-by: Miklos Vajna <vmiklos@suse.cz>
Signed-off-by: Noel Power <noel.power@suse.com>
Signed-off-by: Sergey Kishchenko <voidwrk@gmail.com>