[Task] Support the new API to get the port status of ovs.

[hwchiu]

Implement a new restful api to get the port status of specific network.
It contains the PortID, receives packet counts and transmit packet counts.
We need to find a way to mapping the PortID to interface name and then the Pod Name later.

[codecov-io]

Codecov Report

Merging #280 into develop will increase coverage by 0.09%.
The diff coverage is 86.04%.

@@             Coverage Diff             @@
##           develop     #280      +/-   ##
===========================================
+ Coverage    78.57%   78.67%   +0.09%     
===========================================
  Files           60       62       +2     
  Lines         3361     3404      +43     
===========================================
+ Hits          2641     2678      +37     
- Misses         547      551       +4     
- Partials       173      175       +2

Impacted Files	Coverage Δ
src/ovscontroller/ovs_system.go	71.42% <71.42%> (ø)
src/server/route.go	84.61% <83.33%> (-0.07%)	⬇️
src/networkcontroller/network_controller.go	82.6% <84.61%> (+0.33%)	⬆️
src/server/handler_ovs.go	94.11% <94.11%> (ø)

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[John-Lin]

格式有錯？

[John-Lin]

這個PR有需要更新 Vendor/vendor.json 嗎?

[hwchiu]

不需要，因為DumpPort本來就有了，新版的才需要更新