Before this CL, using the reverse bindings to access two Java packages with the same last component would fail with a duplicate package import error. This CL renames generated import statements to use unique aliases. Change-Id: I94696281e58f011f45811445cf81aea02af69c4f Reviewed-on: https://go-review.googlesource.com/34774 Reviewed-by: David Crawshaw <crawshaw@golang.org>