Rft: network & codec

Fmt: code clean

Imp: Improve map access concurrency

* support attachment from map[sting]string to map[string]interface{} in invocation and result
# Conflicts:
#	cluster/router/tag/tag_router.go

fix exporter append

Mod: Remove unnecessary return and judgement.
# Conflicts:
#	cluster/router/tag/tag_router.go