stages/gcp.guest-agent.conf: fix some whitespaces

Be more PEP-8 (two lines between methods). Additionally, separate
the builtin imports from library imports and osbuild imports.

stages/org.osbuild.gcp.guest-agent.conf

@@ -9,10 +9,12 @@ https://github.com/GoogleCloudPlatform/guest-agent#configuration
 
 import os
 import sys
+
 import iniparse
 
 import osbuild.api
 
+
 SCHEMA = r"""
 "definitions": {
   "Accounts": {
@@ -211,6 +213,7 @@ SCHEMA = r"""
 }
 """
 
+
 def option_value_to_str(value):
     """
     Convert allowed types of option values to string.
@@ -225,6 +228,7 @@ def option_value_to_str(value):
         value = str(value)
     return value
 
+
 def make_section(cfg, name, settings):
     if not cfg.has_section(name):
         cfg.add_section(name)
@@ -263,6 +267,7 @@ def main(tree, options):
 
     return 0
 
+
 if __name__ == '__main__':
     args = osbuild.api.arguments()
     r = main(args["tree"], args["options"])