[testrunner] remove the extra characters in progress indicator

After python3 migration, the new print usage started causing leftover character
issues.

This CL fixes the print usage.

R=clemensh@chromium.org,neis@chromium.org
CC=machenbach@chromium.org

Bug: v8:8918
Change-Id: Ibee06677c3bae3e1141579693aa16a539309a566
Reviewed-on: https://chromium-review.googlesource.com/c/1495558
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59961}

tools/testrunner/testproc/progress.py

@@ -215,7 +215,7 @@ class CompactProgressIndicator(ProgressIndicator):
     }
     status = self._truncate(status, 78)
     self._last_status_length = len(status)
-    print(status, end=' ')
+    print(status, end='')
     sys.stdout.flush()
 
   def _truncate(self, string, length):
@@ -241,7 +241,7 @@ class ColorProgressIndicator(CompactProgressIndicator):
     super(ColorProgressIndicator, self).__init__(templates)
 
   def _clear_line(self, last_length):
-    print("\033[1K\r", end=' ')
+    print("\033[1K\r", end='')
 
 
 class MonochromeProgressIndicator(CompactProgressIndicator):
@@ -255,7 +255,7 @@ class MonochromeProgressIndicator(CompactProgressIndicator):
     super(MonochromeProgressIndicator, self).__init__(templates)
 
   def _clear_line(self, last_length):
-    print(("\r" + (" " * last_length) + "\r"), end=' ')
+    print(("\r" + (" " * last_length) + "\r"), end='')
 
 
 class JsonTestProgressIndicator(ProgressIndicator):