add cobbler api authentication options

add cobbler api authentication options: username and password, which
can be provided if authentication is enabled or cobbler api is behind
a proxy that needs authentication.

contrib/inventory/cobbler.ini

@@ -5,6 +5,10 @@
 
 host = http://PATH_TO_COBBLER_SERVER/cobbler_api
 
+# If API needs authentication add 'username' and 'password' options here.
+#username = foo
+#password = bar
+
 # API calls to Cobbler can be slow. For this reason, we cache the results of an API
 # call. Set this to the path you want cache files to be written to. Two files
 # will be written to this directory:

contrib/inventory/cobbler.py

@@ -120,6 +120,9 @@ class CobblerInventory(object):
     def _connect(self):
         if not self.conn:
             self.conn = xmlrpclib.Server(self.cobbler_host, allow_none=True)
+            self.token = None
+            if self.cobbler_username is not None:
+                self.token = self.conn.login(self.cobbler_username, self.cobbler_password)
 
     def is_cache_valid(self):
         """ Determines if the cache files have expired, or if it is still valid """
@@ -140,6 +143,12 @@ class CobblerInventory(object):
         config.read(os.path.dirname(os.path.realpath(__file__)) + '/cobbler.ini')
 
         self.cobbler_host = config.get('cobbler', 'host')
+        self.cobbler_username = None
+        self.cobbler_password = None
+        if config.has_option('cobbler', 'username'):
+            self.cobbler_username = config.get('cobbler', 'username')
+        if config.has_option('cobbler', 'password'):
+            self.cobbler_password = config.get('cobbler', 'password')
 
         # Cache related
         cache_path = config.get('cobbler', 'cache_path')
@@ -163,8 +172,10 @@ class CobblerInventory(object):
         self._connect()
         self.groups = dict()
         self.hosts = dict()
-
-        data = self.conn.get_systems()
+        if self.token is not None:
+            data = self.conn.get_systems(self.token)
+        else:
+            data = self.conn.get_systems()
 
         for host in data:
             # Get the FQDN for the host and add it to the right groups