Replace replication start multi-line log statement

Use a shorter and more informative single line string:

```
Starting replication f9a503bf456a4779fd07901a6dbdb501+continuous+create_target (http://adm:*****@127.0.0.1:15984/a/ -> http://adm:*****@127.0.0.1:15984/bar/) from doc _replicator:my_rep2 worker_procesess:4 worker_batch_size:500 session_id:b4df2a53e33fb6441d82a584a8888f85
```

For replication from _replicate endpoint, doc info is skipped and it is clearly
indicated a `_replicate` replication:

```
Starting replication aa0aa3244d7886842189980108178651+continuous+create_target (http://adm:*****@localhost:15984/a/ -> http://adm:*****@localhost:15984/t/) from _replicate endpoint worker_procesess:4 worker_batch_size:500 session_id:6fee11dafc3d8efa6497c67ecadac35d
```

Also remove redundant `starting new replication...` log.

1 files changed, 26 insertions, 21 deletions

diff --git a/src/couch_replicator/src/couch_replicator_scheduler_job.erl b/src/couch_replicator/src/couch_replicator_scheduler_job.erl
index bc7438757..e7ce576f4 100644
--- a/src/couch_replicator/src/couch_replicator_scheduler_job.erl
+++ b/src/couch_replicator/src/couch_replicator_scheduler_job.erl
@@ -95,8 +95,6 @@ start_link(#rep{id = {BaseId, Ext}, source = Src, target = Tgt} = Rep) ->
 
     case gen_server:start_link(ServerName, ?MODULE, Rep, []) of
         {ok, Pid} ->
-            couch_log:notice("starting new replication `~s` at ~p (`~s` -> `~s`)",
-                             [RepChildId, Pid, Source, Target]),
             {ok, Pid};
         {error, Reason} ->
             couch_log:warning("failed to start replication `~s` (`~s` -> `~s`)",
@@ -184,24 +182,7 @@ do_init(#rep{options = Options, id = {BaseId, Ext}, user_ctx=UserCtx} = Rep) ->
     % cancel_replication/1) and then start the replication again, but this is
     % unfortunately not immune to race conditions.
 
-    couch_log:notice("Replication `~p` is using:~n"
-        "~c~p worker processes~n"
-        "~ca worker batch size of ~p~n"
-        "~c~p HTTP connections~n"
-        "~ca connection timeout of ~p milliseconds~n"
-        "~c~p retries per request~n"
-        "~csocket options are: ~s~s",
-        [BaseId ++ Ext, $\t, NumWorkers, $\t, BatchSize, $\t,
-            MaxConns, $\t, get_value(connection_timeout, Options),
-            $\t, get_value(retries, Options),
-            $\t, io_lib:format("~p", [get_value(socket_options, Options)]),
-            case StartSeq of
-            ?LOWEST_SEQ ->
-                "";
-            _ ->
-                io_lib:format("~n~csource start sequence ~p", [$\t, StartSeq])
-            end]),
-
+    log_replication_start(State),
     couch_log:debug("Worker pids are: ~p", [Workers]),
 
     doc_update_triggered(Rep),
@@ -465,7 +446,6 @@ format_status(_Opt, [_PDict, State]) ->
     #rep{
        id = RepId,
        options = Options,
-       type = Type,
        doc_id = DocId,
        db_name = DbName
     } = RepDetails,
@@ -1043,6 +1023,31 @@ replication_start_error(Error) ->
     Error.
 
 
+log_replication_start(#rep_state{rep_details = Rep} = RepState) ->
+    #rep{
+       id = {BaseId, Ext},
+       doc_id = DocId,
+       db_name = DbName,
+       options = Options
+    } = Rep,
+    Id = BaseId ++ Ext,
+    Workers = get_value(worker_processes, Options),
+    BatchSize = get_value(worker_batch_size, Options),
+    #rep_state{
+       source_name = Source,  % credentials already stripped
+       target_name = Target,  % credentials already stripped
+       session_id = Sid
+    } = RepState,
+    From = case DbName of
+        ShardName when is_binary(ShardName) ->
+            io_lib:format("from doc ~s:~s", [mem3:dbname(ShardName), DocId]);
+        _ ->
+            "from _replicate endpoint"
+    end,
+    Msg = "Starting replication ~s (~s -> ~s) ~s worker_procesess:~p"
+        " worker_batch_size:~p session_id:~s",
+    couch_log:notice(Msg, [Id, Source, Target, From, Workers, BatchSize, Sid]).
+
 
 -ifdef(TEST).