Automatically learn keys from smartcards
* src/keycache.cpp (do_populate_smartcards) (gpgagent_transact, gpgsm_learn): New.
This checks if there are unknown keys on a smartcard
by the keygrip. If keys are not found then gpgsm --learn-card
The idea behind this is to have a plug and play mechanism
- GnuPG-Bug-Id: T4877