Restore --disable-driver-mounts flag

[tstromberg]

Closes #5019

[k8s-ci-robot]

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[medyagh]

unit test failing:

ok  	k8s.io/minikube/pkg/minikube/service	0.047s	coverage: 35.9% of statements
--- FAIL: TestNewSSHClient (0.14s)
    ssh_mock.go:173: Listening on 127.0.0.1:45585
    ssh_mock.go:83: Accepting...
    ssh_mock.go:83: Accepting...
    ssh_mock.go:132: exec request received: &{Type:exec WantReply:true Payload:[0 0 0 3 102 111 111] ch:0xc000132780 mux:<nil>}
    sshutil_test.go:60: Error running "foo": wait: remote command exited without exit status or exit signal
    ssh_mock.go:189: Stopping
FAIL

[medyagh]

unit test failing

[tstromberg]

unit test failing

Flake :(