Binding generator v2 - uses statement - uses inner type #1

Binding generator v2 - uses statement - uses inner type #1

- for current implementation of yangtools does not copy "types" from groupings,
but the original definition of a type is reused, so we should find inner type
added by uses by original node.
  this patch should be merged with:
  - https://git.opendaylight.org/gerrit/60529
  - https://git.opendaylight.org/gerrit/60582

- add test yangs

Change-Id: Ia82bc7b298c91bbc3ef34cfb26fea75eed5ff2b2
Signed-off-by: Jie Han <han.jie@zte.com.cn>