broker: drop uuid from "hello" log messages

Problem: we toss uuids into the logs like they are going to be
useful for debugging but we really don't have any way to use
those for anything and they reduce the signal/noise ratio.

Drop uuids from the "hello" log messages.

Author: garlick

src/broker/overlay.c

@@ -1092,10 +1092,9 @@ static void hello_request_handler (struct overlay *ov, const flux_msg_t *msg)
      */
     if (subtree_is_online (child->status)) { // crash
         flux_log (ov->h, LOG_ERR,
-                  "%s (rank %lu) reconnected after crash, dropping old uuid %s",
+        "%s (rank %lu) reconnected after crash, dropping old connection state",
                   flux_get_hostbyrank (ov->h, child->rank),
-                  (unsigned long)child->rank,
-                  child->uuid);
+                  (unsigned long)child->rank);
         overlay_child_status_update (ov, child, SUBTREE_STATUS_LOST);
         hello_log_level = LOG_ERR; // want hello log to stand out in this case
     }
@@ -1112,10 +1111,9 @@ static void hello_request_handler (struct overlay *ov, const flux_msg_t *msg)
 
     flux_log (ov->h,
               hello_log_level,
-              "accepting connection from %s (rank %lu) uuid %s status %s",
+              "accepting connection from %s (rank %lu) status %s",
               flux_get_hostbyrank (ov->h, child->rank),
               (unsigned long)child->rank,
-              child->uuid,
               subtree_status_str (child->status));
 
     if (!(response = flux_response_derive (msg, 0))
@@ -1126,10 +1124,9 @@ static void hello_request_handler (struct overlay *ov, const flux_msg_t *msg)
     return;
 error_log:
     flux_log (ov->h, LOG_ERR,
-              "rejecting connection from %s (rank %lu) uuid %s: %s",
+              "rejecting connection from %s (rank %lu): %s",
               flux_get_hostbyrank (ov->h, rank),
               (unsigned long)rank,
-              uuid,
               reason);
 error:
     if (!(response = flux_response_derive (msg, errno))