Add opentracing dependency

go.mod

@@ -34,6 +34,7 @@ require (
 	github.com/mitchellh/mapstructure v1.1.2
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
 	github.com/nacos-group/nacos-sdk-go v0.0.0-20190723125407-0242d42e3dbb
+	github.com/opentracing/opentracing-go v1.1.0
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v1.1.0 // indirect
 	github.com/samuel/go-zookeeper v0.0.0-20180130194729-c4fab1ac1bec

go.sum

@@ -369,6 +369,7 @@ github.com/opencontainers/image-spec v1.0.1 h1:JMemWkRwHx4Zj+fVxWoMCFm/8sYGGrUVo
 github.com/opencontainers/image-spec v1.0.1/go.mod h1:BtxoFyWECRxE4U/7sNtV5W15zMzWCbyJoFRP3s7yZA0=
 github.com/opencontainers/runc v0.1.1 h1:GlxAyO6x8rfZYN9Tt0Kti5a/cP41iuiO2yYT0IJGY8Y=
 github.com/opencontainers/runc v0.1.1/go.mod h1:qT5XzbpPznkRYVz/mWwUaVBUv2rmF59PVA73FjuZG0U=
+github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
 github.com/ory/dockertest v3.3.4+incompatible h1:VrpM6Gqg7CrPm3bL4Wm1skO+zFWLbh7/Xb5kGEbJRh8=
 github.com/ory/dockertest v3.3.4+incompatible/go.mod h1:1vX4m9wsvi00u5bseYwXaSnhNrne+V0E6LAcBILJdPs=
 github.com/packethost/packngo v0.1.1-0.20180711074735-b9cb5096f54c h1:vwpFWvAO8DeIZfFeqASzZfsxuWPno9ncAebBEP0N3uE=