audit: set_user_session: user_session.uid is an unsigned int

We were using %d in the format string to display the users uid.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
gitignore: Add the app binary

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
app: Reduce the scope of various variables

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
url_handlers: Reduce the scope of sid in login()

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
utils: Reduce the scope of various variables

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>