Add two options --generate_config_file_only and --server_config_generation_path
Add two options --generate_config_file_only and --server_config_generation_path

Add two options --generate_config_file_only and --server_config_generation_path to
facilitate testing the ESP nginx configuration file and the ESP server configuration file.

cloudendpoints/endpoints-tools,cloudendpoints/endpoints-tools,cloudendpoints/endpoints-tools