scd:nks: Emit the algo string with KEYPAIRINFO
* scd/app-nks.c (do_learn_status_core): Emit the algo string as part of a KEYPAIRINFO. (struct fid_cache_s): Add field algostr. (flush_fid_cache): Release it. (keygripstr_from_pk_file): Fill it and add it to the cache. Use a single exit label. Set algostr.
This has been backported to keep this, and only this, module in sync
with master. All other changes from the original patch have been