Add static tag route Demo: can be used to reduce `time to return` by avoid service call accross the IDC.

[zhouyao1994]

The project dubbo-samples-tagrouter change the rule by yml There are some scenarios where you need to write tags directly on dubbo , i think may be can add this example in it.

This strategy can be used to reduce time to return by avoid service call accross the IDC. This can be achieved by putting the same tag on the same IDC service

[zhouyao1994]

It would be better if we design this demo in spring-boot style config.

I agree，may be i can modify this,and pull request again.

[AlbumenJ]

Please fix failed test cases