Use bin_ and genfiles_ directories derived from the ctx, not the configuration

For Bazel (open source Blaze), users can have multiple repositories
and we are moving towards having one bin/genfiles dir per repository.
This means that bin_dir and genfiles_dir need to be rule-specific, not
configuration-specific, since the configuration is not repository-specific.
ctx.configuration.bin_dir and ctx.configuration.genfiles_dir have been
deprecated and now we'd like to remove them entirely.

The new fields are only available in Bazel 0.4.0+.
Tested:
    TAP --sample for global presubmit queue
    []

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=141791797

java/google/registry/builddefs/zip_file.bzl

@@ -148,7 +148,11 @@ def _zip_file(ctx):
       'cd "${repo}"',
       'rm -rf "${tmp}"',
   ]
-  script = ctx.new_file(ctx.configuration.bin_dir, '%s.sh' % ctx.label.name)
+  if hasattr(ctx, 'bin_dir'):
+    script = ctx.new_file(ctx.bin_dir, '%s.sh' % ctx.label.name)
+  else:
+    # TODO(user): remove this once Bazel 4.0+ is required.
+    script = ctx.new_file(ctx.configuration.bin_dir, '%s.sh' % ctx.label.name)
   ctx.file_action(output=script, content='\n'.join(cmd), executable=True)
   inputs = [ctx.file._zipper]
   inputs += [dep.zip_file for dep in ctx.attr.deps]