generic_executor.py: Minor: Change class description.
generic_executor.py: Minor: Change class description.

calin-iorgulescu/vmchecker,calin-iorgulescu/vmchecker,rosedu/vmchecker,rosedu/vmchecker,rosedu/vmchecker,rosedu/vmchecker,calin-iorgulescu/vmchecker,rosedu/vmchecker,calin-iorgulescu/vmchecker,calin-iorgulescu/vmchecker,rosedu/vmchecker,calin-iorgulescu/vmchecker