Stop using list

Producing the list of all slots to try appeared to be expensive.  In volume tests taking 150 - 250 microseconds per GET.  Perhaps the list could be long (>1000), with a split and append, so not surprising.

Instead loop and count.

src/leveled_log.erl

@@ -319,8 +319,7 @@
         {info, "Microsecond timings for hashtree build of "
                 ++ "to_list ~w sort ~w build ~w"}},
     {"CDB15",
-        {info, "Cycle count of ~w in hashtable search higher than expected"
-                ++ " in search for hash ~w with result ~w"}},
+        {info, "Collision in search for hash ~w"}},
     {"CDB16",
         {info, "CDB scan from start ~w in file with end ~w and last_key ~w"}},
     {"CDB17",