fix typo

tests/test_mediaworker.py

@@ -35,7 +35,7 @@ def check_ssh(ip):
 def run_tests(ip):
     print('Updating envsetup tests on MediaWorker')
     cmd = 'ssh -t %s cd /root/envsetup && git pull'
-    os.systrm(cmd)
+    os.system(cmd)
     print('Running envsetup tests on MediaWorker')
     cmd = 'ssh -t %s /root/envsetup/tester.py' % ip
     status = os.system(cmd)