project.py: decode byte output from check_result

When running project.py under Python 3, the output is a byte sequence, and
the bazel location gets written to the .bazel_path file as:

  bazel=b'/usr/local/bin/bazel'

This causes launching the project in Eclipse to fail.

To prevent this, decode the byte sequence back to a string.

Change-Id: Ia0e1c7f1e4f934e245dc85d83a01089034679024

tools/eclipse/project.py

@@ -57,7 +57,7 @@ def retrieve_ext_location():
   return check_output(['bazel', 'info', 'output_base']).strip()
 
 def gen_bazel_path():
-  bazel = check_output(['which', 'bazel']).strip()
+  bazel = check_output(['which', 'bazel']).strip().decode('UTF-8')
   with open(path.join(ROOT, ".bazel_path"), 'w') as fd:
     fd.write("bazel=%s\n" % bazel)
     fd.write("PATH=%s\n" % environ["PATH"])