Fix some bugs

To prevent extreme cases, the data returned by the non-cache interface is not corresponding to the notification, resulting in data inconsistency

Fix the problem of default signature method

Fix the problem that the signature method may lose part of the path

v1.2.12: Merge pull request #67 from 647-coder/feat/siki

[feat]: Fix mulit slb node update notification ID bug & Support heart beat

v1.2.11: Merge pull request #62 from yoyofxteam/viper_181

upgrade viper version

v1.2.10

1. 增加自定义签名实现，可选配置项

fix some bug

1. 修正配置容灾备份时，只会保存当前内存中存在的na
   mespace的问题

v1.2.8

Merge pull request #54 from ShineJstar/ShineJstar-patch-updateAgolloM…

v1.2.7

[fix] fixed the problem that goroutine did not exit after stopping

v1.2.6

[feat] 1. 优化了DefaultNamespace的使用体验，注释和测试用例

v1.2.5

[fix] 1. 极端情况下配置/备份为更新，而notificationid已经更新到最新 2. 初始化namespace时，先初始化完再…