Reduce some error level logging to info as they are normal responses to client requests when using snaphot. Also send benign_other in corner case of unable to find block.
Reduce some error level logging to info as they are normal responses to client requests when using snaphot. Also send benign_other in corner case of unable to find block.

EOSIO/eos,EOSIO/eos,EOSIO/eos,EOSIO/eos,EOSIO/eos