libnss-aad has no on-demand facility for debugging #2
Description
At present, libnss-aad will emit debugging messages to stdout if compiled in debug mode, but is otherwise completely silent. On-demand debugging output when in release mode would help diagnosis.
Investigate using the "log" crate, and controlling output using an environment variable (NSSAAD_VERBOSE=1 or the like). Possibly emit levels (ERR, WARN, INFO, etc) to /var/log/auth.log?