BUG-1425: fix toString() invocation on LazyObject

When we are coming in from toString(), the proxy invocation does not
work. Extract getAugmentations() into a private method and use that
instead.

Change-Id: Ia851560b7703817f6d75887fa7e80037292e3fd1
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-1425: fix toString() invocation on LazyObject"