[jsonnet] Update to Jsonnet 0.8.1

RELNOTES: [jsonnet] Update to Jsonnet 0.8.1.

--
MOS_MIGRATED_REVID=105303487

tools/build_defs/jsonnet/jsonnet.bzl

diff --git a/tools/build_defs/jsonnet/jsonnet.bzl b/tools/build_defs/jsonnet/jsonnet.bzl
index 3a0e477..91f371f 100644
--- a/tools/build_defs/jsonnet/jsonnet.bzl
+++ b/tools/build_defs/jsonnet/jsonnet.bzl
@@ -75,14 +75,7 @@
     output_json_files = [ctx.new_file(ctx.configuration.bin_dir, out.name)
                          for out in ctx.attr.outs]
     outputs += output_json_files
-    command += ["-m", ctx.file.src.path]
-    # Currently, jsonnet -m creates the output files in the current working
-    # directory. Append mv commands to move the output files into their
-    # correct output directories.
-    # TODO(dzc): Remove this hack when jsonnet supports a flag for setting
-    # an output directory.
-    for json_file in output_json_files:
-      command += ["; mv %s %s" % (json_file.basename, json_file.path)]
+    command += ["-m", output_json_files[0].dirname, ctx.file.src.path]
   else:
     if len(ctx.attr.outs) > 1:
       fail("Only one file can be specified in outs if multiple_outputs is " +
@@ -91,7 +84,7 @@
     compiled_json = ctx.new_file(ctx.configuration.bin_dir,
                                  ctx.attr.outs[0].name)
     outputs += [compiled_json]
-    command += [ctx.file.src.path, "> %s" % compiled_json.path]
+    command += [ctx.file.src.path, "-o", compiled_json.path]
 
   compile_inputs = (
       [ctx.file.src, ctx.file._jsonnet, ctx.file._std] +