fix typo

tests/test_mediaworker.py

@@ -33,7 +33,7 @@ def check_ssh(ip):
     return True
 
 def check_apt(ip):
-    print('Checkout apt-get update on MediaWorker')
+    print('Checking apt-get update on MediaWorker')
     cmd = 'ssh %s apt-get update' % ip
     try:
         subprocess.check_output(cmd, shell=True, timeout=10)