Revert "The upload-authentication-file comes from networkcache section."

This reverts commit b6730a8b.

src/zc/buildout/buildout.py

@@ -358,8 +358,6 @@ class Buildout(UserDict.DictMixin):
                     'upload-cache-url', '')
                 self.upload_dir_url = networkcache_section.get(
                     'upload-dir-url', '')
-                self.upload_authentication_file = networkcache_section.get(
-                    'upload-authentication-file', '')
                 self.signature_certificate_file = networkcache_section.get(
                     'signature-certificate-file', '')
                 self.signature_private_key_file = networkcache_section.get(
@@ -375,7 +373,6 @@ class Buildout(UserDict.DictMixin):
                 options['__networkcache__download-dir-url'] = self.download_dir_url
                 options['__networkcache__upload-cache-url'] = self.upload_cache_url
                 options['__networkcache__upload-dir-url'] = self.upload_dir_url
-                options['__networkcache__upload-authentication-file'] = self.upload_authentication_file
                 options['__networkcache__signature-certificate-file'] = self.signature_certificate_file
                 options['__networkcache__signature-private-key-file'] = self.signature_private_key_file