Change some error logs to info (#101)
Some loged errros are benign and might be better reported as Info.
save state Does not alter program flow, and any error is reported further up the stack.
prune client state error Does not alter program flow, error is not acted upon.
Redis returned 0 rows after select returning zero rows from a select is not necessarily an error.
get block to extend - no notarized block no error returned, program flow unaltered.
generate block - multiple tries no error returned, program flow unaltered.
sending the best block to the network no error returned, program flow unaltered.
handleNoProgress only report the last the failure as an error.
save transactions - slow no error is returned by function.
