IF: Add needed dependencies to the INSTANT_FINALITY protocol feature

[greg7mdp]

Resolves #2162

Also changed a elog to wlog in fork_database, as the check is stricter than it used to be, and the warning occurs often in normal testing.

[ericpassmore]

Note:start
group: IF
category: TEST
summary: Note: Changes Instant Finality Protocol Activation Digest. Tune logging inside fork_database to be less verbose now that stricter checks are in place.
Note:end