e2e: "[Feature: AdvancedStatefulSet] Scaling tidb cluster with advanced statefulset " is flaky

[cofyc]

Bug Report

https://internal.pingcap.net/idc-jenkins/blue/organizations/jenkins/operator_ghpr_e2e_test_kind/detail/operator_ghpr_e2e_test_kind/2273/tests

Stacktrace
/home/jenkins/agent/workspace/operator_ghpr_e2e_test_kind/go/src/github.com/pingcap/tidb-operator/tests/e2e/tidbcluster/serial.go:139
Jan 10 10:04:16.182: Unexpected error:
<*meta.NoKindMatchError | 0xc0010bb400>: {
GroupKind: {Group: "pingcap.com", Kind: "TidbCluster"},
SearchedVersions: ["v1alpha1"],
}
no matches for kind "TidbCluster" in version "pingcap.com/v1alpha1"
occurred
/home/jenkins/agent/workspace/operator_ghpr_e2e_test_kind/go/src/github.com/pingcap/tidb-operator/tests/e2e/tidbcluster/serial.go:241

k8s version: v1.12.10

[cofyc]

another failure
https://internal.pingcap.net/idc-jenkins/blue/organizations/jenkins/operator_ghpr_e2e_test_kind/detail/operator_ghpr_e2e_test_kind/2274/pipeline

k8s version: v1.12.10

[cofyc]

https://internal.pingcap.net/idc-jenkins/blue/organizations/jenkins/operator_ghpr_e2e_test_kind/detail/operator_ghpr_e2e_test_kind/2718/tests

Stacktrace
/home/jenkins/agent/workspace/operator_ghpr_e2e_test_kind/go/src/github.com/pingcap/tidb-operator/tests/e2e/tidbcluster/serial.go:149
Feb 10 12:32:06.309: Unexpected error:
<*errors.errorString | 0xc00026d650>: {
s: "timed out waiting for the condition",
}
timed out waiting for the condition
occurred
/home/jenkins/agent/workspace/operator_ghpr_e2e_test_kind/go/src/github.com/pingcap/tidb-operator/tests/e2e/tidbcluster/serial.go:277

[2020-02-10T12:22:05.038Z] �[1mSTEP�[0m: Scaling sts serial-6992/deploy-tidb to replicas 2 and setting deleting pods to [1] (old replicas: 0, old delete slots: [])
[2020-02-10T12:22:05.038Z] �[1mSTEP�[0m: Waiting for all pods of tidb cluster component tidb (sts: serial-6992/deploy-tidb) are in desired state (replicas: 2, delete slots: [1])
[2020-02-10T12:22:06.615Z] I0210 12:22:06.301333      15 serial.go:267] replicas of sts serial-6992/deploy-tidb is 824646695392, expects 2
[2020-02-10T12:22:11.870Z] I0210 12:22:11.305179      15 serial.go:267] replicas of sts serial-6992/deploy-tidb is 824646780944, expects 2
[2020-02-10T12:22:17.125Z] I0210 12:22:16.491646      15 serial.go:267] replicas of sts serial-6992/deploy-tidb is 824650207616, expects 2
``