capture itemized output from rsync

This CL causes the stdout of rsync quickmerge to get captured rather
than sent to the terminal.

BUG=chromium:229234
TEST=Modified unit test so that it passes.
Change-Id: Ib65c2812b736e7556a28aa8712a03c7825ed8df2
Reviewed-on: https://gerrit.chromium.org/gerrit/47960
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Brian Harring <ferringb@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
diff --git a/scripts/autotest_quickmerge_unittest.py b/scripts/autotest_quickmerge_unittest.py
index c7dcd8b..2b45532 100755
--- a/scripts/autotest_quickmerge_unittest.py
+++ b/scripts/autotest_quickmerge_unittest.py
@@ -88,8 +88,7 @@
     autotest_quickmerge.RsyncQuickmerge(source_path, sysroot_path,
                                         include_file_name,
                                         pretend=True,
-                                        overwrite=False,
-                                        quiet=False)
+                                        overwrite=False)
 
     self.assertCommandContains(expected_command)