Add a exception flag for print_config_report_error

[micahjohnson150]

• inicheck version: 0.7.9
• Python version: 3.6

Description

Most of the software we use has a line that goes like the following:

 
warnings, errors = check_config(self.ucfg)
print_config_report(warnings, errors)

if len(errors) > 0:
   self.log.error("Error in config file. Check report above.")
   sys.exit() # Or raises an exception

A nice recommendation by @scotthavens is to add the latter part to print_conifg_report and enable it with a flag to incur an exception in the event errors are which would then look like for the end use:

 
warnings, errors = check_config(self.ucfg)
print_config_report(warnings, errors, exception_on_errors=True)