##### SUMMARY

SyntaxWarning over using is for comparison of literals. The fix is simple and is a good beginner issue.

```
contrib/inventory/cobbler.py:218: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if this_dns_name is not None and this_dns_name is not "":
```

##### ISSUE TYPE

- Bug Report

##### COMPONENT NAME

cobbler

##### ANSIBLE VERSION

devel branch
""" Reads the settings from the environment """
        
        
        
        
        
        
        
        self.cobbler_host = os.getenv('COBBLER_host', None)
        self.cobbler_username = os.getenv('COBBLER_username', None)
        self.cobbler_password = os.getenv('COBBLER_password', None)
        
        cache_path = os.getenv('COBBLER_cache_path', None)
        if(cache_path is not None):
            self.cache_path_cache = cache_path + "/ansible-cobbler.cache"
            self.cache_path_inventory = cache_path + "/ansible-cobbler.index"
        self.cache_max_age = int(os.getenv('COBBLER_cache_max_age', "30"))
        
        
        if(os.getenv('COBBLER_ignore_settings', False) == "True"):
            self.ignore_settings = True
    def parse_cli_args(self):