Merge pull request !5 from WangLH/featskywalking

2. 优化 trace 相关的逻辑

 Conflicts:
	src/main/resources/application-local.yaml

Merge pull request !23 from dylan/feature/errorcode

 Conflicts:
	src/main/resources/application.yaml

Merge pull request !28 from timfruit/feature/multi-datasource

梳理 druid 的配置