The original names were more intuitive: the generate_counter counts the
number of generate requests, and the reseed_counter counts the number
of reseedings (of the principal DRBG).
reseed_gen_counter -> generate_counter
reseed_prop_counter -> reseed_counter
This is the anologue to commit 8380f453ec on the 1.1.1 stable branch.
The only difference is that the second renaming has already been reverted
on the master branch.
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12941)
