Refactor proxy

Makefile

cmd/masterservice/main.go

cmd/proxy/node/proxy_node.go

cmd/proxy/service/proxy_service.go

cmd/singlenode/main.go

internal/allocator/allocator.go

internal/allocator/id.go

internal/allocator/retry.go

internal/allocator/timestamp.go

internal/distributed/masterservice/client.go

internal/distributed/masterservice/server.go

internal/distributed/proxynode/client.go

internal/distributed/proxynode/config_key.go

internal/distributed/proxynode/paramtable.go

internal/distributed/proxynode/service.go

internal/distributed/proxyservice/client.go

internal/distributed/proxyservice/paramtable.go

internal/distributed/proxyservice/service.go

internal/master/master_test.go

internal/proto/master.proto