Bug 1249857 - Do not print times when running mach from config.status; r=nalexander

Currently, config.status runs `mach artifact install`. mach commands prefix
output lines with elapsed time by default. When running from `mach build`,
there will be 2 sets of times in `mach artifact install` output lines.
When config.status is run directly, there will be no times printed
except for `mach artifact install`. It is weird both ways.

Fix it by not printing lines when running `mach artifact install` from
config.status.

MozReview-Commit-ID: GVinyI4Z0qr

--HG--
extra : rebase_source : 80aa5714a0249d9974becee183e7cfde7143f556
extra : amend_source : a89bca7af847f73efd18fb0a09bc9e76d8943577

python/mozbuild/mozbuild/config_status.py

@@ -199,4 +199,9 @@ def config_status(topobjdir='.', topsrcdir='.',
     if env.substs.get('MOZ_ARTIFACT_BUILDS', False):
         # Execute |mach artifact install| from the top source directory.
         os.chdir(topsrcdir)
-        return subprocess.check_call([sys.executable, os.path.join(topsrcdir, 'mach'), 'artifact', 'install'])
+        return subprocess.check_call([
+            sys.executable,
+            os.path.join(topsrcdir, 'mach'),
+            '--log-no-times',
+            'artifact',
+            'install'])