slapos.package: Use do_upgrade and not main

 This was a legacy when it was used as script directly

setup.py

@@ -29,7 +29,7 @@ setup(name=name,
           'console_scripts': [
               # Those entry points are development version and
               # self updatable API
-              'slappkg-update-raw = slapos.package.update:main',
+              'slappkg-update-raw = slapos.package.update:do_update',
               'slappkg-discover-raw = slapos.package.distribution:do_discover',
               'slappkg-upload-key-raw = slapos.package.upload_key:main',
               'slappkg-update = slapos.package.autoupdate:do_update',

slapos/package/update.py

@@ -164,7 +164,7 @@ class Upgrader:
     """
     self.checkConsistency(fixit=not self.config.dry_run)
 
-def main():
+def do_update():
   """Update computer and slapos"""
   usage = "usage: %s [options] " % sys.argv[0]
   # Parse arguments
@@ -172,5 +172,3 @@ def main():
   upgrader.run()
   sys.exit()
 
-if __name__ == '__main__':
-  main()