jsc,job,wreck: change key from lwj to jobid for consistency

fixes: flux-framework#1408

src/common/libjsc/jstatctl.c

@@ -665,7 +665,7 @@ static int send_state_event (flux_t *h, job_state_t st, int64_t j)
                         jsc_job_num2state (st));
         goto done;
     }
-    if ((msg = flux_event_pack (topic, "{ s:I }", "lwj", j)) == NULL) {
+    if ((msg = flux_event_pack (topic, "{ s:I }", "jobid", j)) == NULL) {
         flux_log_error (h, "flux_event_pack");
         goto done;
     }
@@ -1137,7 +1137,7 @@ static void job_state_cb (flux_t *h, flux_msg_handler_t *mh,
     if (flux_msg_get_topic (msg, &topic) < 0)
         goto done;
 
-    if (flux_event_unpack (msg, NULL, "{ s:I }", "lwj", &jobid) < 0) {
+    if (flux_event_unpack (msg, NULL, "{ s:I }", "jobid", &jobid) < 0) {
         flux_log (h, LOG_ERR, "%s: bad message", __FUNCTION__);
         goto done;
     }

src/modules/wreck/job.c

@@ -192,7 +192,7 @@ static void send_create_event (flux_t *h, int64_t id,
         walltime = val;
 
     msg = flux_event_pack (topic, "{s:I,s:s,s:i,s:i,s:i,s:i}",
-                          "lwj", id, "kvs_path", path,
+                          "jobid", id, "kvs_path", path,
                           "ntasks", ntasks,
                           "ncores", ncores,
                           "nnodes", nnodes,

src/modules/wreck/wrexecd.c

@@ -1127,7 +1127,7 @@ void send_job_state_event (struct prog_ctx *ctx, const char *state)
     }
 
     if ((msg = flux_event_pack (topic, "{ s:I, s:s }",
-                                "lwj", ctx->id,
+                                "jobid", ctx->id,
                                 "kvs_path", ctx->kvspath)) == NULL) {
         wlog_err (ctx, "flux_event_pack: %s", flux_strerror (errno));
         goto out;