'beat algo execute' now displays the stderr of the containerized process in case of failure

beat/cmdline/algorithms.py

@@ -323,6 +323,9 @@ def execute(prefix, cache, instructions_file):
     # Execute the algorithm
     with executor:
       result = executor.process(host)
+      if result['status'] != 0:
+          print 'STDERR:'
+          print result['stderr']
 
     # Display the results
     if configuration.has_key('outputs'):   # Standard algorithm