Sentinel: config-rewrite unique ID just one time

src/sentinel.c

@@ -1646,16 +1646,16 @@ void rewriteConfigSentinelOption(struct rewriteConfigState *state) {
     dictEntry *de;
     sds line;
 
+    /* sentinel unique ID. */
+    line = sdscatprintf(sdsempty(), "sentinel myid %s", sentinel.myid);
+    rewriteConfigRewriteLine(state,"sentinel",line,1);
+
     /* For every master emit a "sentinel monitor" config entry. */
     di = dictGetIterator(sentinel.masters);
     while((de = dictNext(di)) != NULL) {
         sentinelRedisInstance *master, *ri;
         sentinelAddr *master_addr;
 
-        /* sentinel unique ID. */
-        line = sdscatprintf(sdsempty(), "sentinel myid %s", sentinel.myid);
-        rewriteConfigRewriteLine(state,"sentinel",line,1);
-
         /* sentinel monitor */
         master = dictGetVal(de);
         master_addr = sentinelGetCurrentMasterAddress(master);