Description of problem:
After swap to etcd3, the etcd report "grpc: addrConn.resetTransport failed to create client transport: connection error. "

The smoke testing pass (restart master/nodes/openvswith/oc get nodes/oc start-build/deploy pod/access service and  openshift ex diagnostics)

Version-Release number of selected component (if applicable):
atomic-openshift-3.1.1.8-1.git.0.d469026.el7aos.x86_64

How reproducible:
always

Steps to Reproduce:
1. install ocp 3.1.1.8 with external clustered etcd.
2. upgrade to etcd3 step by step.
   etcd-2.1.1 -> etcd-2.2.2 -> etcd-2.2.5 -> etcd-2.3.7-> etcd3-3.0.3etcd3-3.0.3
3. check the etcd3 status
4. run smoke testing.

Actual results:
3&4, the smoke testing pass, while etcd3 status report the following error
[root@etcd20-2 ~]# systemctl status etcd -l
● etcd.service - Etcd Server
   Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
   Active: active (running) since Mon 2016-11-28 03:24:30 EST; 5min ago
 Main PID: 17647 (etcd)
   CGroup: /system.slice/etcd.service
           └─17647 /usr/bin/etcd --name=openshift-195.lab.eng.nay.redhat.com --data-dir=/var/lib/etcd/ --listen-client-urls=https://192.168.1.246:2379

Nov 28 03:27:18 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:27:27 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:27:33 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:27:36 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:28:40 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:28:44 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:29:20 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:29:21 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:29:29 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}
Nov 28 03:29:37 etcd20-2.novalocal etcd[17647]: grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: remote error: bad certificate"; Reconnecting to {"192.168.1.246:2379" <nil>}

Expected results:


Additional info: