Goctl rpc patch (#117)

* remove mock generation

* add: proto project import

* update document

* remove mock generation

* add: proto project import

* update document

* remove NL

* update document

* optimize code

* add test

* add test

tools/goctl/rpc/test.proto

@@ -0,0 +1,28 @@
+syntax = "proto3";
+// protoc -I=${GOPATH}/src -I=. test.proto --go_out=plugins=grpc,Mbase.proto=github.com/tal-tech/go-zero/tools/goctl/rpc:./test
+package test;
+// @github.com/tal-tech/go-zero/tools/goctl/rpc
+import "base.proto";
+import "google/protobuf/any.proto";
+
+message request {
+  string name = 1;
+}
+enum Gender{
+  UNKNOWN = 0;
+  MALE = 1;
+  FEMALE = 2;
+}
+message response {
+  string greet = 1;
+  google.protobuf.Any data = 2;
+
+}
+message map {
+  map<string, string> m = 1;
+}
+
+service Greeter {
+  rpc greet(request) returns (response);
+  rpc idRequest(base.IdRequest)returns(base.EmptyResponse);
+}