MB-68823: Revert log to pre review.couchbase.org/c/kv_engine/+/234445

In https://review.couchbase.org/c/kv_engine/+/234445 the connection
details logging at failure became unnecessarily more verbose. This patch
just reverts the logging to the original format and size.

Change-Id: Ia42796aa2a7ba5e0667e58465b21001639fdcb0b
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/234908
Tested-by: Build Bot <[email protected]>
Reviewed-by: Jim Walker <[email protected]>
Well-Formed: Restriction Checker

Author: paolococchi

daemon/protocol/mcbp/engine_wrapper.cc

@@ -904,9 +904,9 @@ cb::engine_errc dcpStreamReq(Cookie& cookie,
     if (ret == cb::engine_errc::disconnect) {
         LOG_WARNING(
                 "{}: dcp.stream_req returned cb::engine_errc::disconnect - "
-                "Connection {}",
+                "Cookie {}",
                 connection.getId(),
-                connection.to_json().dump());
+                cookie.to_json().dump());
         connection.setTerminationReason("Engine forced disconnect");
     }
     return ret;