android: create/clean a temporary directory on startup: directory returned by tempfiles on Android is actually the root directory of the application, so it is not cleaned. To work around that a `/tmp` directory inside it is now created, and cleaned on startup if it already exists.

[DEFAULT]
bridge = pb
log_level = debug
log_fmt = #[%%(levelname)s][%%(name)s] %%(message)s

[cagou]
no_certificate_validation = true
log_level = debug
log_fmt = [%%(levelname)s][%%(name)s] %%(message)s