flake test: WithError(Failed to setup certs)=certificate symlinks

[medyagh]

as seen here:
https://storage.googleapis.com/minikube-builds/logs/7705/c44655c/Docker_Linux.html#fail_TestStartStop%2fgroup%2fold-docker

	I0416 07:59:55.037956   15523 ssh_runner.go:148] Run: sudo /bin/bash -c "test -s /usr/share/ca-certificates/minikubeCA.pem && ln -fs /usr/share/ca-certificates/minikubeCA.pem /etc/ssl/certs/minikubeCA.pem"
	I0416 07:59:55.050765   15523 ssh_runner.go:148] Run: ls -la /usr/share/ca-certificates/minikubeCA.pem
	I0416 07:59:55.056011   15523 certs.go:382] hashing: -rw-r--r-- 1 root root 1066 Apr 16 14:45 /usr/share/ca-certificates/minikubeCA.pem
	I0416 07:59:55.056098   15523 ssh_runner.go:148] Run: openssl x509 -hash -noout -in /usr/share/ca-certificates/minikubeCA.pem
	I0416 07:59:55.063764   15523 ssh_runner.go:148] Run: sudo /bin/bash -c "test -L /etc/ssl/certs/b5213941.0 || ln -fs /etc/ssl/certs/minikubeCA.pem /etc/ssl/certs/b5213941.0"
	I0416 07:59:55.076632   15523 ssh_runner.go:148] Run: sudo /bin/bash -c "test -s /usr/share/ca-certificates/6700.pem && ln -fs /usr/share/ca-certificates/6700.pem /etc/ssl/certs/6700.pem"
	I0416 07:59:55.078009   15523 ssh_runner.go:148] Run: sudo systemctl start kubelet
	I0416 07:59:55.114008   15523 exit.go:58] WithError(Failed to setup certs)=certificate symlinks: create symlink for /usr/share/ca-certificates/6700.pem: sudo /bin/bash -c "test -s /usr/share/ca-certificates/6700.pem && ln -fs /usr/share/ca-certificates/6700.pem /etc/ssl/certs/6700.pem": Process exited with status 1
	stdout:
	
	stderr:
	 called from:
	goroutine 346 [running]:
	runtime/debug.Stack(0x0, 0x0, 0x20fb)
		/usr/local/go/src/runtime/debug/stack.go:24 +0x9d
	k8s.io/minikube/pkg/minikube/exit.WithError(0x1ac8e78, 0x15, 0x1d7d240, 0xc0005bada0)
		/app/pkg/minikube/exit/exit.go:58 +0x34
	k8s.io/minikube/pkg/minikube/node.setupKubeAdm.func2(0x1de8d40, 0xc0004e3290, 0xc000386300, 0x0, 0x0, 0xc00053e6a0, 0xa, 0x20fb, 0xc000622340, 0x8, ...)
		/app/pkg/minikube/node/start.go:276 +0x155
	created by k8s.io/minikube/pkg/minikube/node.setupKubeAdm
		/app/pkg/minikube/node/start.go:274 +0x513
	W0416 07:59:55.114274   15523 out.go:201] Failed to setup certs: certificate symlinks: create symlink for /usr/share/ca-certificates/6700.pem: sudo /bin/bash -c "test -s /usr/share/ca-certificates/6700.pem && ln -fs /usr/share/ca-certificates/6700.pem /etc/ssl/certs/6700.pem": Process exited with status 1
	stdout:
	
	stderr:
	* 
	X Failed to setup certs: certificate symlinks: create symlink for /usr/share/ca-certificates/6700.pem: sudo /bin/bash -c "test -s /usr/share/ca-certificates/6700.pem && ln -fs /usr/share/ca-certificates/6700.pem /etc/ssl/certs/6700.pem": Process exited with status 1
	stdout:
	
	stderr:
	
	* 
	* minikube is exiting due to an error. If the above message is not useful, open an issue:
	  - https://github.com/kubernetes/minikube/issues/new/choose
** /stderr **
start_stop_delete_test.go:132: failed to start minikube post-stop. args "out/minikube-linux-amd64 start -p old-docker-20200416T075527-6700 --memory=2200 --alsologtostderr -v=3 --wait=true --kvm-network=default --kvm-qemu-uri=qemu:///system --disable-driver-mounts --keep-context=false --container-runtime=docker --driver=docker  --kubernetes-version=v1.11.10": exit status 70

To run locally:

make integration -e TEST_ARGS="-test.run TestStartStop/group/old-docker --profile=minikube --cleanup=false --minikube-start-args="--driver=docker""