Don't panic if we fail to parse U2FRegistration data (#17304)

Don't panic if we fail to parse U2FRegistration data (#17304)

* Don't panic if we fail to parse a U2FRegistration data

Downgrade logging statement from Fatal to Error so that errors parsing
U2FRegistration data does not panic; instead, the invalid key will be
skipped and we will attempt to parse the next one, if available.

Signed-off-by: David Jimenez <dvejmz@sgfault.com>