zed: set names for all threads

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11807

cmd/zed/agents/zfs_agents.c

@@ -392,6 +392,7 @@ zfs_agent_init(libzfs_handle_t *zfs_hdl)
 		list_destroy(&agent_events);
 		zed_log_die("Failed to initialize agents");
 	}
+	pthread_setname_np(g_agents_tid, "agents");
 }
 
 void

cmd/zed/agents/zfs_mod.c

@@ -918,6 +918,7 @@ zfs_slm_init()
 		return (-1);
 	}
 
+	pthread_setname_np(g_zfs_tid, "enum-pools");
 	list_create(&g_device_list, sizeof (struct pendingdev),
 	    offsetof(struct pendingdev, pd_node));