添加rename的support

proto/lws.proto

@@ -37,8 +37,9 @@ service LwsVfs {
   rpc fflush(flush) returns (flush) {}
   rpc fopendir(opendir) returns (opendir) {}
   rpc freleasedir(releasedir) returns (releasedir) {}
-  rpc fcreate (create) returns (create) {}
+  rpc fcreate(create) returns (create) {}
   rpc funlink(unlink) returns (unlink) {}
+  rpc frename(rename) returns (rename) {}
 }
 
 // The request message containing the user's name.
@@ -179,26 +180,32 @@ message flush {
   int32 ret = 15;
 }
 
-message opendir{
+message opendir {
   string path = 1;
   file_info fi = 2;
   int32 ret = 15;
 }
 
-message releasedir{
+message releasedir {
   string path = 1;
   file_info fi = 2;
   int32 ret = 15;
 }
 
-message create{
+message create {
   string path = 1;
   uint32 mode = 2;
   file_info fi = 3;
   int32 ret = 15;
 }
 
-message unlink{
+message unlink {
   string path = 1;
   int32 ret = 15;
+}
+
+message rename {
+  string path = 1;
+  string new = 2;
+  int32 ret = 15;
 }