Ftr: Opentracing & Transfer context end2end with jsonrpc protocol

[flycash]

What this PR does:

Now we will use the opentracing to trace our framework.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
This PR only resolve the problem of transferring context between client and server with jsonrpc protocol;
What we need to do is to support transfer context with grpc protocol and dubbo protocol.

Another consideration is that we need to check our code to see whether we need to create more span to trace the invocation.

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@37d517e). Click here to learn what that means.
The diff coverage is 78.94%.

@@            Coverage Diff            @@
##             develop    #335   +/-   ##
=========================================
  Coverage           ?   65.6%           
=========================================
  Files              ?     123           
  Lines              ?    7605           
  Branches           ?       0           
=========================================
  Hits               ?    4989           
  Misses             ?    2123           
  Partials           ?     493

Impacted Files	Coverage Δ
cluster/cluster_impl/broadcast_cluster_invoker.go	80% <ø> (ø)
protocol/invoker.go	0% <ø> (ø)
filter/filter_impl/echo_filter.go	85.71% <ø> (ø)
...ter/cluster_impl/registry_aware_cluster_invoker.go	75% <ø> (ø)
cluster/cluster_impl/failfast_cluster_invoker.go	71.42% <ø> (ø)
cluster/cluster_impl/failsafe_cluster_invoker.go	81.81% <ø> (ø)
filter/filter_impl/tps_limit_filter.go	88.23% <ø> (ø)
common/proxy/proxy_factory/default.go	20.96% <0%> (ø)
protocol/jsonrpc/http.go	75% <0%> (ø)
protocol/jsonrpc/server.go	59.61% <0%> (ø)
... and 3 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 37d517e...0196c0e. Read the comment docs.