code: def check_exec_installed(exec_list):
      
      all_installed = True
      for exe in exec_list:
          if not is_tool(exe):
              print("Executable: " + exe + " is not installed")
              all_installed = False
      return all_installed
docs: Check the required programs are
          installed.
          PARAM exec_list: list of programs to check
          RETURN: True if all installed else False