client: fix dump_mds_requests to valid json format

Usually asok command output will be valid json, but mds_requests
outputs duplicate key "request", which is not convenient for
subsequent parsing.

Fixes: http://tracker.ceph.com/issues/73639

Signed-off-by: haoyixing <[email protected]>

Author: haoyixing

src/client/Client.cc

@@ -2018,13 +2018,15 @@ void Client::dump_mds_sessions(Formatter *f, bool cap_dump)
 
 void Client::dump_mds_requests(Formatter *f)
 {
+  f->open_array_section("requests");
   for (map<ceph_tid_t, MetaRequest*>::iterator p = mds_requests.begin();
        p != mds_requests.end();
        ++p) {
     f->open_object_section("request");
     p->second->dump(f);
     f->close_section();
   }
+  f->close_section();
 }
 
 int Client::verify_reply_trace(int r, MetaSession *session,