[tls_client] pin matching easier debugging
NB: I'm experienced [tls_cl] no pin matched: 1 pins * 3 certificates
errors/warning
- This message doesn't indicate which certificate is at cause. It'd be handy that DEBUG log-level (not only debug-build) would display which item was problematic
- Notice how systemd would display
[tls_cl]
instead of[tls_client]