Protect against duplicate directories from getTree
Protect against duplicate directories from getTree

If the list created as a result of (successive) getTree invocations
contains duplicates, it must be filtered for duplicates to populate the
directoriesIndex.

bazelbuild/bazel-buildfarm,bazelbuild/bazel-buildfarm,bazelbuild/bazel-buildfarm,bazelbuild/bazel-buildfarm,bazelbuild/bazel-buildfarm,bazelbuild/bazel-buildfarm,bazelbuild/bazel-buildfarm