config: Initialize proxy environment prior to fetching includes

In case of ConfigStatic, proxy settings only come from the host
environment. We need them early, prior to fetching the first missing
repo that is pulled via an include.

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

kas/config.py

@@ -336,6 +336,8 @@ class ConfigStatic(Config):
         (self._config, missing_repo_names) = \
             self.handler.get_config(repos=repo_paths)
 
+        self.environ.update(self.get_proxy_config())
+
         while missing_repo_names:
             if missing_repo_names == missing_repo_names_old:
                 raise IncludeException('Could not fetch all repos needed by '