update golang version

[medyagh]

go 1.14.6 fixed the issue which "multiple test were talking over each other" golang/go#39308

fixes #8349

[k8s-ci-robot]

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[medyagh]

/ok-to-test

[minikube-pr-bot]

kvm2 Driver
Times for minikube: [63.870594625 62.148807594 63.781609024999995]
Average time for minikube: 63.267003748

Times for Minikube (PR 8781): [62.747870231 63.469869662 65.14770395400001]
Average time for Minikube (PR 8781): 63.78848128233333

Averages Time Per Log

+--------------------------------+-----------+--------------------+
|              LOG               | MINIKUBE  | MINIKUBE (PR 8781) |
+--------------------------------+-----------+--------------------+
| * minikube v1.12.1 on Debian   |  0.057052 |           0.060793 |
|                           9.11 |           |                    |
| * Using the kvm2 driver based  |  0.018882 |           0.023338 |
| on existing profile            |           |                    |
| * Starting control plane node  |  0.004480 |           0.017743 |
| minikube in cluster minikube   |           |                    |
| * Creating kvm2 VM (CPUs=2,    | 41.027079 |          40.802359 |
| Memory=3700MB, Disk=20000MB)   |           |                    |
| ...                            |           |                    |
| * Preparing Kubernetes v1.18.3 | 20.477547 |          20.690597 |
| on Docker 19.03.12 ...         |           |                    |
| * Verifying Kubernetes         |  1.237322 |           1.640176 |
| components...                  |           |                    |
| * Enabled addons:              |  0.356387 |           0.478870 |
| default-storageclass,          |           |                    |
| storage-provisioner            |           |                    |
| * Done! kubectl is now         |  0.085140 |           0.069769 |
| configured to use "minikube"   |           |                    |
|                                |  0.003115 |           0.004836 |
+--------------------------------+-----------+--------------------+

docker Driver
Times for minikube: [27.412387708999997 27.383450589 26.633988369]
Average time for minikube: 27.143275555666662

Times for Minikube (PR 8781): [25.745537775 25.324334727000004 26.474664659000005]
Average time for Minikube (PR 8781): 25.84817905366667

Averages Time Per Log

+--------------------------------+-----------+--------------------+
|              LOG               | MINIKUBE  | MINIKUBE (PR 8781) |
+--------------------------------+-----------+--------------------+
| * minikube v1.12.1 on Debian   |  0.077421 |           0.083681 |
|                           9.11 |           |                    |
| * Using the docker driver      |  0.002607 |           0.002747 |
| based on existing profile      |           |                    |
| * Starting control plane node  |  0.060429 |           0.057205 |
| minikube in cluster minikube   |           |                    |
| * Creating docker container    |  8.728094 |           8.391539 |
| (CPUs=2, Memory=3700MB) ...    |           |                    |
| * Preparing Kubernetes v1.18.3 | 17.314771 |          16.310532 |
| on Docker 19.03.2 ...          |           |                    |
| * Verifying Kubernetes         |  0.836912 |           0.884635 |
| components...                  |           |                    |
| * Enabled addons:              |  0.059464 |           0.050701 |
| default-storageclass,          |           |                    |
| storage-provisioner            |           |                    |
| * Done! kubectl is now         |  0.059510 |           0.063769 |
| configured to use "minikube"   |           |                    |
|                                |  0.004068 |           0.003370 |
+--------------------------------+-----------+--------------------+