Update DiscoveryService.proto
Update DiscoveryService.proto

Add agentUUID in ApplicationInstance
ascrutae/sky-walking,hanahmily/sky-walking,ascrutae/sky-walking,OpenSkywalking/skywalking,apache/skywalking,apache/skywalking,OpenSkywalking/skywalking,zhangkewei/sky-walking,ascrutae/sky-walking,hanahmily/sky-walking,apache/skywalking,apache/skywalking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,zhangkewei/sky-walking