Duplicate instance ID

#### Overview of the Issue

When I register with different server nodes with the same service instance name, two service instance IDS with the same name will be generated

#### Reproduction Steps

Steps to reproduce this issue, eg:

1. To register instance service-01 for consul-server-0 node;

2. Application restart;

3. To register instance service-01 for consul-server-1 node;

4. At this point, two service instances with the same serviceid are generated

How should I deal with this problem ？Can you give me some advice? Thanks !! @mkeeler @johncowen @rboyer