This patch removes Tarpc & Tonic GRPC and implements a customized rpc framework, which can be used by peer rpc and cli interface.
web config server can also use this rpc framework.
moreover, rewrite the public server logic, use ospf route to implement public server based networking. this make public server mesh possible.
* correctly set mtu, and allow set mtu manually
* communicate between enc and non-enc should not panic
* allow loading cfg from file
* allow change file log level dynamically
Sijie.Sun