Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

Pull request

# gpg: Signature made Tue 14 Jan 2020 09:29:11 GMT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/tracing-pull-request:
  trace: update qemu-trace-stap to Python 3
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

scripts/qemu-trace-stap

-#!/usr/bin/python
+#!/usr/bin/env python3
 # -*- python -*-
 #
 # Copyright (C) 2019 Red Hat, Inc
@@ -18,8 +18,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import print_function
-
 import argparse
 import copy
 import os.path
@@ -104,7 +102,9 @@ def cmd_list(args):
         if verbose:
             print("Listing probes with name '%s'" % script)
         proc = subprocess.Popen(["stap", "-l", script],
-                                stdout=subprocess.PIPE, env=tapset_env(tapsets))
+                                stdout=subprocess.PIPE,
+                                universal_newlines=True,
+                                env=tapset_env(tapsets))
         out, err = proc.communicate()
         if proc.returncode != 0:
             print("No probes found, are the tapsets installed in %s" % tapset_dir(args.binary))