SSSDConfig: Handle integer parsing more leniently
    
    debug_level is usually defined as decimal value <= 10
    or as a hexadecimal value which is used as a bitmask
    
    Parsing of hexadecimal value was partially fixed by commit
    7fac271ccebb84743c39f553eb5ec013cf1d10aa but only for
    sssd domains. It was not fixed for sssd services.
    
      File "/usr/share/authconfig/authinfo.py", line 3142, in writeSSSDPAM
        pam = self.sssdConfig.get_service('pam')
      File "/usr/lib/python3.6/site-packages/SSSDConfig/__init__.py", line 1620, in get_service
        service.set_option(opt['name'], opt['value'])
      File "/usr/lib/python3.6/site-packages/SSSDConfig/__init__.py", line 932, in set_option
        (option_schema[0], optionname, type(value)))
    TypeError: Expected <class 'int'> for debug_level, received <class 'str'>
    
    Resolves:
    https://pagure.io/SSSD/sssd/issue/3410
    
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
    (cherry picked from commit 6df5b36008fef9c1f6dcf8f31af033a467e744c7)