PUBAPI-786, PUBAPI-785: packages pre-loading refactoring
PUBAPI-786, PUBAPI-785: packages pre-loading refactoring

misterbisson/sdc-cloudapi,misterbisson/sdc-cloudapi,joyent/sdc-cloudapi,joyent/sdc-cloudapi,arekinath/sdc-cloudapi,arekinath/sdc-cloudapi,KrisShannon/sdc-cloudapi,KrisShannon/sdc-cloudapi