2. Instance discovery table and data define finish.

2. make stream module as a collector define module, contains grpc remote service for call remote workers
3. worker framework is ok
4. Collector start ok

1. remote worker use common service, send data object with bytes and data define id, use define id to find the grpc deserialize object.
2. merge the metric data and record data to data object.

fix testcase failed

Provide a new id generation and serialization mechanism

fix test case failed

Fix decode bug.

fix issue that httpclient plugin don’t work

* master:
  fix operation id of exit span incorrect issue

fix operation id of exit span incorrect issue

Add agentUUID in ApplicationInstance

2. Add agent register module

Add agentUUID in ApplicationInstance

* 'master' of https://github.com/wu-sheng/sky-walking:
  fix miss transport entryServiceName and entryServiceId value
  fix miss entryServiceId and entryServiceName in ContextSnapshot  issue
  fix issue that open tracing activation set tag failed
  Make sure the JVM stop hook works #295
  Add jvm shutdown hook

# Conflicts:
#	apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/ContextSnapshot.java