Add new member into cache

Current node SDK will create a new member object if
it is not in cache and restore state from persistence,
but it does not add new member in cache.

Change-Id: Ifb7b17e8e40c1b4afe59acefa020eb3f0760ed59
Signed-off-by: grapebaba <281165273@qq.com>

sdk/node/src/hfc.ts

@@ -642,6 +642,7 @@ export class Chain {
         member = new Member(name, self);
         member.restoreState(function (err) {
             if (err) return cb(err);
+            self.members[name]=member;
             cb(null, member);
         });
     }