license.bbclass: import modified license.bbclass from oe-core to package license

* add LICENSE_CREATE_PACKAGE = 1 in conf/local.conf to package license texts in PN-lic

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
distro-feed-configs: add bbappend to limit available feeds on target

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>