config: Remove dead code

Not used anywhere, dates back to dynamic configs.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

kas/config.py

@@ -169,9 +169,3 @@ class Config:
                             for i in
                             self.get_bitbake_targets()
                             if i.startswith('multiconfig')))
-
-    def get_gitlabci_config(self):
-        """
-            Returns the GitlabCI configuration
-        """
-        return self._config.get('gitlabci_config', '')